• 24 Aug 2021 Preprint arXiv

    Demonstration of an entangling gate between non-interacting qubits using the Quantum Zeno effect

    Eliya Blumenthal, Chen Mor, Asaf Diringer, Leigh S Martin, Daniel Burgarth, Katherine Birgitta Whaley, Shay Hacohen-Gourgy
    Abstract
    The Zeno effect occurs in quantum systems when a very strong measurement is applied, which can alter the dynamics in non-trivial ways. Despite being dissipative, the dynamics stay coherent within any degenerate subspaces of the measurement. Here we show that such a measurement can turn a single-qubit operation into a two- or multi-qubit entangling gate, even in ashow more
  • 19 Aug 2021 Preprint arXiv

    Optimized Hamiltonian learning from short-time measurements

    Abstract
    Characterizing noisy quantum devices requires methods for learning the underlying quantum Hamiltonian which governs their dynamics. Often, such methods compare measurements to simulations of candidate Hamiltonians, a task which requires exponential computational complexity. Here, we analyze and optimize a method which circumvents this difficulty using measurements ofshow more
  • 12 Aug 2021 Preprint arXiv

    Quantum tomography of entangled spin-multi-photon states

    Abstract
    We present a novel method for quantum tomography of multi-qubit states. We apply the method to spin-multi-photon states, which we produce by periodic excitation of a semiconductor quantum-dot- confined spin every 1/4 of its coherent precession period. These timed excitations lead to the deterministic generation of strings of entangled photons in a cluster state. We showshow more
  • 11 Aug 2021 Preprint arXiv

    The coherence of quantum dot confined electron- and hole-spin in low external magnetic field

    Abstract
    We investigate experimentally and theoretically the temporal evolution of the spin of the conduction band electron and that of the valence band heavy hole, both confined in the same semiconductor quantum dot. In particular, the coherence of the spin purity in the limit of a weak externally applied magnetic field, comparable in strength to the Overhauser field due toshow more
  • 11 Aug 2021 Science Advances

    Orbital angular momentum multiplication in plasmonic vortex cavities

    Grisha Spektor, Eva Prinz, Michael Hartelt, Anna-Katharina Mahro, Martin Aeschlimann, Meir Orenstein
    Abstract
    Orbital angular momentum of light is a core feature in photonics. Its confinement to surfaces using plasmonics has unlocked many phenomena and potential applications. Here, we introduce the reflection from structural boundaries as a new degree of freedom to generate and control plasmonic orbital angular momentum. We experimentally demonstrate plasmonic vortex cavitiesshow more
  • 5 Aug 2021 Preprint arXiv

    Realizing anomalous Floquet insulators via Chern band annihilation

    Carolyn Zhang, Tobias Holder, Netanel H Lindner, Mark S Rudner, Erez Berg
    Abstract
    Two-dimensional periodically driven systems can host an unconventional topological phase unattainable for equilibrium systems, termed the Anomalous Floquet-Anderson insulator (AFAI). The AFAI features a quasi-energy spectrum with chiral edge modes and a fully localized bulk, leading to non-adiabatic but quantized charge pumping. Here, we show how such a Floquet phaseshow more
  • 5 Aug 2021 Journal Article Physical Review Letters

    Superradiance and Subradiance due to Quantum Interference of Entangled Free Electrons

    Aviv Karnieli, Nicholas Rivera, Ady Arie, Ido Kaminer
    Abstract
    When multiple quantum emitters radiate, their emission rate may be enhanced or suppressed due to collective interference in a process known as super- or subradiance. Such processes are well known to occur also in light emission from free electrons, known as coherent cathodoluminescence. Unlike atomic systems, free electrons have an unbounded energy spectrum, and, thusshow more
  • 20 Jul 2021 Journal Article Physical Review D

    Experimental observation of acceleration-induced thermality

    Abstract
    We examine the radiation emitted by high-energy positrons channeled into silicon crystal samples. The positrons are modeled as semiclassical vector currents coupled to an Unruh-DeWitt detector to incorporate any local change in the energy of the positron. In the subsequent accelerated QED analysis, we discover a Larmor formula and power spectrum that are both thermalizedshow more
  • 20 Jul 2021 Journal Article Physical Review Research

    Room-temperature coherent revival in an ensemble of quantum dots

    Room-temperature coherent revival in an ensemble of quantum dots
    Semiconductor quantum dots (QDs) are nanocrystals with atom-like delta function density of states and discrete energy levels. Advancements in fabrication led to record QD homogeneity and implementation in semiconductor laser structures which exhibit remarkable properties highlighted by ultra-narrow spectral emission and temperature-insensitive operation. An emerging application of such QDs is manipulation of optically induced coherent states of the QDs using ultra-short pulses. The most important of those is a demonstration of the hallmark quantum optics phenomena: collapse and revival of wave functions induced and observed in a QD ensemble in the form of an optical amplifier. The observation of quantum coherent revivals was not observed previously in solids, and in all media it was demonstrated only at cryogenic temperatures. Furthermore, coherently excited discrete homogeneous QD subgroups within an ensemble act as multiple quantum bits, resembling molecules in nuclear magnetic resonance (NMR) and can equally serve for quantum communication, simulation and sensing applications. The room temperature QDs exhibit a record long dephasing time (T2), we envision therefore a host of future compact quantum devices based on high quality QDs which do not require cryogenic cooling.
    Abstract
    We demonstrate the hallmark concept of periodic collapse and revival of coherence in a room-temperature ensemble of quantum dots (QDs) in the form of a 1.5-mm-long optical amplifier. Femtosecond excitation pulses induce coherent interactions with a number of discrete homogeneous QD subgroups within an inhomogeneously broadened ensemble, which interfere constructivelyshow more
  • 30 Jun 2021 Journal Article Advances in Optics and Photonics

    Topological photonics in synthetic dimensions

    Abstract
    Topological photonics is a new and rapidly growing field that deals with topological phases and topological insulators for light. Recently, the scope of these systems was expanded dramatically by incorporating non-spatial degrees of freedom. These synthetic dimensions can range from a discrete ladder of cavity modes or Bloch modes of an array of waveguides to a time-binshow more
  • 14 Jun 2021 Preprint arXiv

    One-dimensional ghost imaging with an electron microscope: a route towards ghost imaging with inelastically scattered electrons

    Enzo Rotunno, Simone Gargiulo, Giovanni Maria Vanacore, Chen Mechel, Amir H Tavabi, R E Dunin Borkowski, Fabrizio Carbone, I Maidan, Matteo Zanfrognini, Stefano Frabboni, T Guner, Ebrahim Karimi, Ido Kaminer, V Grillo
    Abstract
    In quantum mechanics, entanglement and correlations are not just a mere sporadic curiosity, but rather common phenomena at the basis of an interacting quantum system. In electron microscopy, such concepts have not been extensively explored yet in all their implications; in particular, inelastic scattering can be reanalyzed in terms of correlation between the electronshow more
  • 11 Jun 2021 Journal Article Science

    Spatiotemporal imaging of 2D polariton wave packet dynamics using free electrons

    Yaniv Kurman, Raphael Dahan, Hanan Herzig Sheinfux, Kangpeng Wang, Michael Yannai, Yuval Adiv, Ori Reinhardt, Luiz H G Tizei, Steffi Y Woo, Jiahan Li, James H Edgar, Mathieu Kociak, Frank H L Koppens, Ido Kaminer
    Abstract
    Coherent optical excitations in two-dimensional (2D) materials, 2D polaritons, can generate a plethora of optical phenomena that arise from the extraordinary dispersion relations that do not exist in regular materials. Probing of the dynamical phenomena of 2D polaritons requires simultaneous spatial and temporal imaging capabilities and could reveal unknown coherentshow more
  • 11 Jun 2021 Journal Article Physical Review Letters

    Toward Atomic-Resolution Quantum Measurements with Coherently Shaped Free Electrons

    Abstract
    Free electrons provide a powerful tool for probing material properties at atomic resolution. Recent advances in ultrafast electron microscopy enable the manipulation of free-electron wave functions using laser pulses. It would be of great importance if one could combine the spatial resolution of electron microscopes with the ability of laser pulses to probe coherentshow more
  • 11 Jun 2021 Physical Review Letters

    Towards atomic-resolution quantum measurements with coherently-shaped free electrons

    Abstract
    Free electrons provide a powerful tool for probing material properties at atomic resolution. Recent advances in ultrafast electron microscopy enable the manipulation of free-electron wave functions using laser pulses. It would be of great importance if one could combine the spatial resolution of electron microscopes with the ability of laser pulses to probe coherentshow more
  • 8 Jun 2021 Journal Article eLight

    Highlighting photonics: looking into the next decade

    Zhigang Chen, Mordechai Segev
    Abstract
    Let there be light–to change the world we want to be! Over the past several decades, and ever since the birth of the first laser, mankind has witnessed the development of the science of light, as light-based technologies have revolutionarily changed our lives. Needless to say, photonics has now penetrated into many aspects of science and technology, turning intoshow more
  • 8 Jun 2021 Poster Proceedings of Electron Beam Spectroscopy for Nanooptics 2021 (EBSN2021)

    Achieving Single-Electron–Single-Photon Interaction in a Transmission Electron Microscope Using 2D Cherenkov Radiation

    Abstract
    Over 80 years of research into free-electron radiation have not yet changed its popular description as a three-dimensional, classical electromagnetic wave1–5, best exemplified by the Cherenkov effect – the radiation of charged particles exceeding the speed of light in a medium1,6. Free-electron radiation was predicted to fundamentally change in reduced dimensionality7–9show more
  • 4 Jun 2021 Conference Paper 52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics

    Employing deep neural networks in the analysis of visual data in ultracold atoms experiments

    Abstract
    Deep learning reconstruction models enable the analysis of noisy physical data with unparalleled accuracy. These tools prove to be extremely useful when analyzing absorption imaging signals that suffer from structural structured noise due to slow changes in the illumination. Most of this noise can be removed by taking two successive exposures. Even then, some noiseshow more
  • 3 Jun 2021 Journal Article SciPost Physics

    Hierarchy of many-body invariants and quantized magnetization in anomalous Floquet insulators

    Frederik Nathan, Dmitry A Abanin, Netanel H Lindner, Erez Berg, Mark S Rudner
    Abstract
    We uncover a new family of few-body topological phases in periodically driven fermionic systems in two dimensions. These phases, which we term correlation-induced anomalous Floquet insulators (CIAFIs), are characterized by quantized contributions to the bulk magnetization from multi-particle correlations, and are classified by a family of integer-valued topologicalshow more
  • 2 Jun 2021 Conference Paper 52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics

    Progress on the JILA Gen. III eEDM Experiment

    Sun Yool Park, Kia Boon Ng, Noah Schlossberger, Anzhou Wang, Yan Zhou, Tanya Roussy, Trevor Wright, Luke Caldwell, Tanner Grogan, Yuval Shagam, Antonio Vigil, Gus Santaella, Madeline Pettine, Jun Ye, Eric A Cornell
    Abstract
    The third generation (Gen. III) apparatus for the measurement of the electron electric dipole moment (eEDM) at JILA utilizes ThF+, rather than HfF+, because: (i) the eEDM sensitive state of ThF+ promises a longer coherence time (~ 20 seconds) [1,2], and (ii) its 50% larger effective electric field increases eEDM sensitivity [3,4]. The “conveyor belt” of 100 consecutiveshow more
  • 2 Jun 2021 Conference Paper 52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics

    Projected Sensitivity of the JILA Gen. II eEDM Experiment

    Trevor Wright, Tanya Roussy, Kia Boon Ng, Noah Schlossberger, Sun Yool Park, Luke Caldwell, Anzhou Wang, Antonio Vigil, Gustavo Santaella, Tanner Grogan, Yan Zhou, Yuval Shagam, Madeline Pettine, Jun Ye, Eric A Cornell
    Abstract
    A new limit on the permanent electric dipole moment of the electron (eEDM) will probe physics beyond the standard model and shed light on open questions such as the baryon asymmetry and dark matter. Our upcoming measurement of the eEDM uses a thermal cloud of HfF+ ions held in an RF trap, allowing us to leverage second-scale coherence times and the large internal electricshow more
  • 2 Jun 2021 Conference Paper 52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics

    Characterization of systematic shifts in the 2nd generation JILA eEDM experiment

    Luke Caldwell, Tanya Roussy, Trevor Wright, Kia Boon Ng, Noah Schlossberger, Sun Yool Park, Anzhou Wang, Tanner Grogan, Yan Zhou, Yuval Shagam, Antonio Vigil, Gustavo Santaella, Madeline Pettine, Jun Ye, Eric A Cornell
    Abstract
    To improve our nuclear beta decay asymmetry experiment [B. Fenker et al. Phys. Rev. Lett. 120 062502 (2018)]), we are trying to improve the vector polarization of our laser-cooled atoms from our present 99.1 +- 0.1% [B. Fenker et al. New J. Phys 18 073028 (2016)]. We cycle on and off a MOT, and optically pump 37K atoms with trap off. We use circularly polarized lightshow more
  • 1 Jun 2021 Conference Paper 52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics

    Quantum speed limits crossover probed by matter wave interferometry

    Gal Ness, Manolo Rivera Lam, Wolfgang Alt, Dieter Meschede, Yoav Sagi, Andrea Alberti
    Abstract
    Quantum speed limits dictate the rate of quantum state evolution and thus restrict the maximal performance of any quantum technology. The two most celebrated limits are formulated in terms of the state's energy uncertainty (Mandelstam-Tam bound) and average energy (Margolus-Levitin bound). We perform matter wave interferometry experiments and track the motion of a singleshow more
  • 27 May 2021 Journal Article Physical Review A

    Stability of the Grabert master equation

    Abstract
    We study the dynamics of a quantum system having Hilbert space of finite dimension dH . Instabilities are possible provided that the master equation governing the system's dynamics contain nonlinear terms. Here we consider the nonlinear master equation derived by Grabert. The dynamics near a fixed point is analyzed by using the method of linearization, andshow more
  • 25 May 2021 Journal Article Quantum Materials

    Critical charge fluctuations and emergent coherence in a strongly correlated excitonic insulator

    Pavel A Volkov, Mai Ye, Himanshu Lohani, Irena Feldman, Amit Kanigel, Girsh Blumberg
    Abstract
    Excitonic insulator is a coherent electronic phase that results from the formation of a macroscopic population of bound particle-hole pairs - excitons. With only a few candidate materials known, the collective excitonic behavior is challenging to observe, being obscured by crystalline lattice effects. Here we use polarization-resolved Raman spectroscopy to reveal theshow more
  • 14 May 2021 Conference Paper CLEO: QELS Fundamental Science 2021

    Sub-wavelength Spin Excitations Driven by Stimulated Raman Transitions in Ultracold Gases

    Abstract
    We present sub-wavelength periodic spin textures of spatially varying Raman Rabi frequency created by evanescent-wave optical lattice. Our results open the door to the study of spin excitation dynamics in ultracold gases.
  • 14 May 2021 Conference Paper CLEO: Science and Innovations 2021

    Coherently-Shaped Free Electrons as High-Resolution Probes of Coherence in Quantum Systems

    Abstract
    We propose a novel technique that leverages free electrons coherently-shaped by laser pulses to measure quantum coherence in materials, opening the way toward the full characterization of the state of quantum systems at atomic-scale resolution.
  • 14 May 2021 Conference Paper CLEO: QELS Fundamental Science 2021

    Observation of 2D Cherenkov radiation and its Quantized Photonic Nature Using Free-Electrons

    Abstract
    Using a dispersion-engineered structure supporting hybrid photonic-plasmonic surface polaritons, we present the first observation of 2D Cherenkov radiation from free electrons, with record-strong electron–polariton quantum coupling that reaches the single-electron-single-photon interaction regime.
  • 14 May 2021 Conference Paper CLEO: QELS Fundamental Science 2021

    Ultrafast non-destructive measurement of the quantum state of light with free electrons

    Abstract
    We demonstrate that free electrons can be used as ultrafast non-destructive photon detectors. Particularly, we show how one can measure photon statistics, temporal coherence, and implement full quantum state tomography using free electrons.
  • 14 May 2021 Conference Paper CLEO: QELS Fundamental Science 2021

    The Fock-State Laser: Macroscopic Quantum States of Light Based on Deep Strong Light-Matter Coupling

    Nicholas Rivera, Jamison Sloan, Ido Kaminer, Marin Soljacic
    Abstract
    We show that coupled light-matter systems reaching the deep strong coupling regime can be coupled to gain media to form novel types of lasers emitting macroscopic quantum states of light, e.g. many-photon Fock states.
  • 14 May 2021 Conference Paper

    Free Electrons Can Induce Quantum Correlations Between Two Separate Photonic Cavities

    Abstract
    We find that free electrons passing through two independent photonic cavities induce quantum correlations between them, creating nonzero quantum mutual information and second-order coherence. The concept is general and applicable for example in electron-phonon interactions.
  • 14 May 2021 Conference Paper CLEO: QELS Fundamental Science 2021

    Photonic Topological Insulators Controlled by Nonlocal Nonlinearity in Synthetic Dimensions

    Abstract
    We study nonlinear effects in synthetic space photonic topological insulators. This nonlinearity is nonlocal in the synthetic dimensions. We study time-periodic solitons making a cyclotron-like motion in the synthetic space bulk.
  • 14 May 2021 Conference Paper CLEO: QELS Fundamental Science

    Manipulating Single Surface Plasmon Polariton via Tailored Atom-Photon Interaction

    Rituraj, Meir Orenstein, Shanhui Fan
    Abstract
    We study the interaction of a single surface plasmon polariton with a finite number of atoms and with an infinite atomic lattice. Using only two-level atoms, we achieve subscattering, superscattering, and electromagnetically induced transparency (EIT).
  • 14 May 2021 Conference Paper CLEO: QELS Fundamental Science 2021

    The Synthetic Hilbert Space of Laser-Driven Free-Electrons

    Abstract
    We propose the concept of free-electrons carrying qudits. We find how electron–laser interactions can shape the electron energy states into arbitrarily-large synthetic Hilbert spaces, exemplified here for size-4.
  • 14 May 2021 Conference Paper CLEO: QELS Fundamental Science 2021

    Quantum optics in strongly-driven many-body systems

    Andrea Pizzi, Alexey Gorlach, Nicholas Rivera, Andreas Nunnenkamp, Ido Kaminer
    Abstract
    We develop the quantum theory of collective light emission in strongly-driven many-body systems. We show how quantum correlations of the emitters can be transferred to the emitted light, leading to generation of non-classical many-photon states.
  • 14 May 2021 Conference Paper CLEO: QELS Fundamental Science 2021

    Superradiant Cathodoluminescence

    Abstract
    We find that laser-driven free-electrons can be coherently-shaped to induce superradiance from many-body quantum emitters. This effect provides new capabilities in electron microscopy&spectroscopy, using high spatio-temporal resolution for coherent control and enhancement of cathodoluminescence.
  • 14 May 2021 Conference Paper CLEO: QELS Fundamental Science 2021

    Quantum-to-classical transition of laser-shaped ultrafast free electrons in phase space

    Bin Zhang, Avraham Gover, Ido Kaminer, Yiming Pan
    Abstract
    Here, we propose a Smith-Purcell model for shaping free electrons with laser. We find that the quantum interference and deformation of the modulated electrons in phase space are vital for understanding the quantum-to-classical transition.
  • 14 May 2021 Conference Paper CLEO: QELS_Fundamental Science 2021

    Superradiant and subradiant light emission from entangled free electrons

    Aviv Karnieli, Nicholas Rivera, Ido Kaminer, Ady Arie
    Abstract
    We show how quantum correlations such as entanglement give rise to a new quantum regime of superradaince and subradiance from free-electrons, demonstrating that light emission can be sensitive to the quantum state of many-body wavefunctions.
  • 13 May 2021 Journal Article Nature Communications

    Combining density functional theory with macroscopic QED for quantum light-matter interactions in 2D materials

    Mark Kamper Svendsen, Yaniv Kurman, Peter Schmidt, Frank H L Koppens, Ido Kaminer, Kristian Sommer Thygesen
    Abstract
    A quantitative and predictive theory of quantum light-matter interactions in ultra thin materials involves several fundamental challenges. Any realistic model must simultaneously account for the ultra-confined plasmonic modes and their quantization in the presence of losses, while describing the electronic states from first principles. Herein we develop such a frameworkshow more
  • 12 May 2021 Journal Article Light-Science & Applications

    Creating heralded hyper-entangled photons using Rydberg atoms

    Abstract
    Entangled photon pairs are a fundamental component for testing the foundations of quantum mechanics, and for modern quantum technologies such as teleportation and secured communication. Current state-of-the-art sources are based on nonlinear processes that are limited in their efficiency and wavelength tunability. This motivates the exploration of physical mechanismsshow more
  • 7 May 2021 Preprint arXiv

    Imprinting the quantum statistics of photons on free electrons

    Raphael Dahan, Alexey Gorlach, Urs Haeusler, Aviv Karnieli, Ori Eyal, Peyman Yousefi, Mordechai Segev, Ady Arie, Gadi Eisenstein, Peter Hommelhoff, Ido Kaminer
    Abstract
    The fundamental interaction between free electrons and light stands at the base of both classical and quantum physics, with applications in free-electron acceleration, radiation sources, and electron microscopy. Yet, to this day, all experiments involving free-electron light interactions are fully explained by describing the light as a classical wave, disregarding itsshow more
  • 30 Apr 2021 Journal Article Science Advances

    The coherence of light is fundamentally tied to the quantum coherence of the emitting particle

    Aviv Karnieli, Nicholas Rivera, Ady Arie, Ido Kaminer
    Abstract
    Coherent emission of light by free charged particles is believed to be successfully captured by classical electromagnetism in all experimental settings. However, recent advances triggered fundamental questions regarding the role of the particle wave function in these processes. Here, we find that even in seemingly classical experimental regimes, light emission isshow more
  • 29 Apr 2021 Preprint arXiv

    Vortex beams of atoms and molecules

    Alon Luski, Yair Segev, Rea David, Ora Bitton, Hila Nadler, A Ronny Barnea, Alexey Gorlach, Ori Cheshnovsky, Ido Kaminer, Edvardas Narevicius
    Abstract
    Angular momentum plays a central role in a multitude of phenomena in quantum mechanics, recurring in every length scale from the microscopic interactions of light and matter to the macroscopic behavior of superfluids. Vortex beams, carrying intrinsic orbital angular momentum (OAM), are now regularly generated with elementary particles such as photons and electrons, andshow more
  • 21 Apr 2021 Preprint arXiv

    Photonic Topological Anderson Insulators

    Simon Stützer, Yonatan Plotnik, Yaakov Lumer, Paraj Titum, Netanel H Lindner, Mordechai Segev, Mikael C Rechtsman, Alexander Szameit
    Abstract
    The hallmark property of two-dimensional topological materials is the incredible robustness of the quantized Hall conductivity to disorder. That robustness arises from the fact that in the topological band gap, transport can occur only along the edges modes, which are immune to scattering. However, for sufficiently strong disorder, the band gap closes and the systemshow more
  • 14 Apr 2021 Journal Article Journal of Applied Physics

    Performance analysis of diamond-based masers

    Abstract
    Masers, the microwave analog of lasers, are an important class of devices that can be used to generate highly coherent and stable microwave signals as well as quantum-limited amplification of microwave photons. Recently, the interest in such devices has increased, probably owing to experiments demonstrating the successful operation at room temperature of solid-stateshow more
  • 14 Apr 2021 Preprint arXiv

    Failed excitonic quantum phase transition in Ta2Ni(Se1−xSx)5

    Pavel A Volkov, Mai Ye, Himanshu Lohani, Irena Feldman, Amit Kanigel, Girsh Blumberg
    Abstract
    We study the electronic phase diagram of the excitonic insulator candidates Ta2Ni(Se1−xSx)5 [x=0, ...,1] using Raman spectroscopy. Critical excitonic fluctuations are observed, that diminish with x and ultimately shift to high energies, characteristic of a quantum phase transition. Nonetheless, a symmetry-breaking transition at finite temperatures is detected for allshow more
  • 12 Apr 2021 Preprint arXiv

    Observing quantum-speed-limit crossover with matter wave interferometry

    Gal Ness, Manolo Rivera Lam, Wolfgang Alt, Dieter Meschede, Yoav Sagi, Andrea Alberti
    Abstract
    Quantum mechanics sets fundamental limits on how fast quantum states can be transformed in time. Two well-known quantum speed limits are the Mandelstam-Tamm (MT) and the Margolus-Levitin (ML) bounds, which relate the maximum speed of evolution to the system's energy uncertainty and mean energy, respectively. Here, we test concurrently both limits in a multi-level systemshow more
  • 29 Mar 2021 Preprint arXiv

    Prethermalization and entanglement dynamics in interacting topological pumps

    Raffael Gawatz, Ajit C Balram, Erez Berg, Netanel H Lindner, Mark S Rudner
    Abstract
    We investigate the formation of quasisteady states in one-dimensional pumps of interacting fermions at non-integer filling fraction, in the regime where the driving frequency and interaction strength are small compared to the instantaneous single-particle band gap throughout the driving cycle. The system rapidly absorbs energy from the driving field, and approaches ashow more
  • 17 Mar 2021 Journal Article Nature Communications

    Control of quantum electrodynamical processes by shaping electron wavepackets

    Liang Jie Wong, Nicholas Rivera, Chitraang Murdia, Thomas Højlund Christensen, John D Joannopoulos, Marin Soljacic, Ido Kaminer
    Abstract
    Fundamental quantum electrodynamical (QED) processes, such as spontaneous emission and electron-photon scattering, encompass phenomena that underlie much of modern science and technology. Conventionally, calculations in QED and other field theories treat incoming particles as single-momentum states, omitting the possibility that coherent superposition states, i.e.show more
  • 16 Mar 2021 Conference Paper Bulletin of the American Physical Society

    Customizable neural-network states for topological phases

    Agnes Valenti, Eliska Greplova, Netanel H Lindner, Sebastian D Huber
    Abstract
    The theory of open quantum systems is crucial for quantum science and engineering. Simulations of such systems are computationally expensive due to the exponential growth of the extended Hilbert spaces' dimensionality. We propose an efficient machine learning approach to simulate such dynamics using a probabilistic formulation of quantum mechanics based on the positiveshow more
  • 16 Mar 2021 Conference Paper Bulletin of the American Physical Society

    Spin-Excitations of 1T-TaS2 and Related Magnetoresistance in the 4Hb Phase

    Itai Silber, Itamar Kimchi, David Graf, Amit Kanigel, Yoram Dagan
    Abstract
    Spin-spin interactions can lead to exotic ground states with emergent excitations in frustrated quantum magnets. Such a system is the transition metal dichalcogenide TaS2. While the 1T phase of the material is electrically insulating and exhibits no magnetic ordering down to millikelvin temperatures, the specific heat has a linear fermionic-type contribution that suggestsshow more
  • 16 Mar 2021 Conference Paper Bulletin of the American Physical Society

    Observation of a Smooth Polaron-Molecule Transition in a Degenerate Fermi Gas

    Gal Ness, Constantine Shkedrov, Yanay Florshaim, Oriana K Diessel, Jonas von Milczewski, Richard Schmidt, Yoav Sagi
    Abstract
    Understanding the behavior of a spin impurity strongly-interacting with a Fermi sea is a long-standing challenge in many-body physics. For short-range interactions and zero temperature, most theories predict a first-order phase transition between a polaronic ground state and a molecular one. We study this question with an ultracold Fermi gas, utilizing a novelshow more
  • 12 Mar 2021 Journal Article Nature Communications

    In-situ observation of trapped carriers in organic metal halide perovskite films with ultra-fast temporal and ultra-high energetic resolutions

    Kanishka Kobbekaduwa, Shreetu Shrestha, Pan Adhikari, Exian Liu, Lawrence Coleman, Jianbing Zhang, Ying Shi, Yuanyuan Zhou, Yehonadav Bekenstein, Feng Yan, Apparao M Rao, Hsinhan Tsai, Matthew C Beard, Wanyi Nie, Jianbo Gao
    Abstract
    We in-situ observe the ultrafast dynamics of trapped carriers in organic methyl ammonium lead halide perovskite thin films by ultrafast photocurrent spectroscopy with a sub-25 picosecond time resolution. Upon ultrafast laser excitation, trapped carriers follow a phonon assisted tunneling mechanism and a hopping transport mechanism along ultra-shallow to shallow trapshow more
  • 12 Mar 2021 Journal Article Physical Review Research

    Tensor networks contraction and the belief propagation algorithm

    Roy Alkabetz, Itai Arad
    Abstract
    Belief propagation is a well-studied message-passing algorithm that runs over graphical models and can be used for approximate inference and approximation of local marginals. The resulting approximations are equivalent to the Bethe-Peierls approximation of statistical mechanics. Here, we show how this algorithm can be adapted to the world of projected-entangled-pair-stateshow more
  • 8 Mar 2021 Preprint arXiv

    Correlation-Enhanced Neural Networks as Interpretable Variational Quantum States

    Agnes Valenti, Eliska Greplova, Netanel H Lindner, Sebastian D Huber
    Abstract
    Variational methods have proven to be excellent tools to approximate ground states of complex many body Hamiltonians. Generic tools like neural networks are extremely powerful, but their parameters are not necessarily physically motivated. Thus, an efficient parametrization of the wave-function can become challenging. In this letter we introduce a neural-network basedshow more
  • 3 Mar 2021 Preprint arXiv

    An area law for 2D frustration-free spin systems

    Anurag Anshu, Itai Arad, David Gosset
    Abstract
    We prove that the entanglement entropy of the ground state of a locally gapped frustration-free 2D lattice spin system satisfies an area law with respect to a vertical bipartition of the lattice into left and right regions. We first establish that the ground state projector of any locally gapped frustration-free 1D spin system can be approximated to within error ϵ byshow more
  • 1 Mar 2021 Journal Article Science Advances

    Shaping quantum photonic states using free electrons

    Adi Ben Hayun, Ori Reinhardt, Jonathan Nemirovsky, Aviv Karnieli, Nicholas Rivera, Ido Kaminer
    Abstract
    It is a long-standing goal to create light with unique quantum properties such as squeezing and entanglement. We propose the generation of quantum light using free-electron interactions, going beyond their already ubiquitous use in generating classical light. This concept is motivated by developments in electron microscopy, which recently demonstrated quantum free-electronshow more
  • 26 Feb 2021 Preprint arXiv

    Comment on: "Nonlinear quantum effects in electromagnetic radiation of a vortex electron"

    Aviv Karnieli, Roei Remez, Ido Kaminer, Ady Arie
    Abstract
    This comment on the Phys. Rev. A paper "Nonlinear quantum effects in electromagnetic radiation of a vortex electron" by Karlovets and Pupasov-Maximov [Phys. Rev. A 103, 12214 (2021)] addresses their criticism of the combined experimental and theoretical study "Observing the quantum wave nature of free electrons through spontaneous emission" by Remez et al, published inshow more
  • 18 Feb 2021 Preprint arXiv

    Absence of heating in a uniform Fermi gas created by periodic driving

    Abstract
    Ultracold atoms are a powerful resource for quantum technologies. As such, they are usually confined in an external potential that often depends on the atomic spin, which may lead to inhomogeneous broadening, phase separation and decoherence. Dynamical decoupling provides an approach to mitigate these effects by applying an external field that induces rapid spin rotationsshow more
  • 8 Feb 2021 Journal Article Physical Review Research

    Fast universal two-qubit gate for neutral fermionic atoms in optical tweezers

    Abstract
    An array of ultracold neutral atoms held in optical microtraps is a promising platform for quantum computation. One of the major bottlenecks of this platform is the weak coupling strength between adjacent atoms, which limits the speed of two-qubit gates. Here, we present a method to perform a fast universal √SWAP gate with fermionic atoms that interact through ashow more
  • 1 Feb 2021 Journal Article Annalen Der Physik

    Free‐Electron Qubits

    Abstract
    Free‐electron interactions with laser‐driven nearfields can quantize the electrons’ energy spectrum and provide control over this quantized degree of freedom. The study proposes to use such interactions to promote free electrons as carriers of quantum information and show how to create a qubit on a free electron, which holds promise for applications in electron microscopyshow more
  • 27 Jan 2021 Journal Article IEEE Nanotechnology Magazine

    1.5-mm Indium Phosphide-Based Quantum Dot Lasers and Optical Amplifiers: The Impact of Atom-Like Optical Gain Material for Optoelectronics Devices

    Abstract
    Using quantum dot (QD) structures as active material for optoelectronics was already in focus before the development of quantum well (QW) lasers and before semiconductor lasers occupied an important place in the market. The big step in reducing laser threshold conditions by substituting bulk gain materials with QWs should find a logical continuation by further reducingshow more
  • 26 Jan 2021 Patent

    Layered material based quantum light emitting device

    Michael Engel, Mathias Steiner, Andrea C Ferrari, Antonio Lombardo, Matteo Barbone, Mete Atature, Carmen Palacios-Berraquero, Dhiren M Kara, Ilya Goykhman
    Abstract
    A quantum light emitting device includes a carrier substrate, an insulator, a first semiconductor device, a second semiconductor device, a first contact, and a second contact. The quantum light device includes a carrier substrate comprising silicon and configured with an electrically insulating top surface. The quantum light device also includes an insulator configuredshow more
  • 20 Jan 2021 Journal Article Optica

    Quantum correlations in electron microscopy

    Chen Mechel, Yaniv Kurman, Aviv Karnieli, Nicholas Rivera, Ady Arie, Ido Kaminer
    Abstract
    Electron microscopes provide a powerful platform for exploring physical phenomena with nanoscale resolution, based on the interaction of free electrons with the excitations of a sample such as phonons, excitons, bulk plasmons, and surface plasmons. The interaction usually results in the absorption or emission of such excitations, which can be detected directly throughshow more
  • 22 Dec 2020 arXiv

    Ultrafast non-destructive measurement of the quantum state of light using free electrons

    Abstract
    Since the birth of quantum optics, the measurement of quantum states of nonclassical light has been of tremendous importance for advancement in the field. To date, conventional detectors such as photomultipliers, avalanche photodiodes, and superconducting nanowires, all rely at their core on linear excitation of bound electrons with light, posing fundamental restrictionsshow more
  • 7 Dec 2020 Physical Review B

    Selective noise resistant gate

    Abstract
    Realizing individual control on single qubits in a spin-based quantum register is an ever-increasing challenge due to the close proximity of the qubits’ resonance frequencies. Current schemes typically suffer from an inherent trade-off between fidelity and qubits selectivity. Here, we report on a scheme which combines noise protection by dynamical decoupling and magneticshow more
  • 3 Dec 2020 arXiv

    Security Proof Against Collective Attacks for an Experimentally Feasible Semi-Quantum Key Distribution Protocol

    WO Krawec, Rotem Liss, Tal Mor
    Abstract
    Semi-quantum key distribution (SQKD) allows two parties (Alice and Bob) to create a shared secret key, even if one of those parties (say, Alice) is classical. However, most SQKD protocols suffer from practical security problems. The recently developed "Classical Alice with a Controllable Mirror" protocol [Boyer, Katz, Liss, and Mor, Phys. Rev. A 96, 062335 (2017)] isshow more
  • 1 Dec 2020 Optics & Photonics News

    Branched Flow of Light

    Abstract
    Branched flow is a universal wave phenomenon in which waves form channels of enhanced intensity that keep dividing as they propagate, resulting in a beautiful pattern resembling the branches of a tree. First observed for electrons, it can occur for virtually any kind of wave. Recently, we presented the experimental observation of branched flow of light.
  • 1 Dec 2020 Optics & Photonics News

    Toward Quantum Optics with Free Electrons

    Kangpeng Wang, Raphael Dahan, Saar Nehemia, Ori Reinhardt, Shai Tsesses, Ido Kaminer, Ofer Kfir, Hugo Lourenço-Martins, Armin Feist, Claus Ropers, Tobias J Kippenberg
    Abstract
    The weak coupling between free electrons and light remains the limiting factor that has prevented access to versatile electron–photon physics, such as the entanglement of individual photons and electrons. This year, we demonstrated that photonic cavities can increase the coupling strength of electrons and light by more than an order of magnitude.
  • 30 Nov 2020 TPNC 2020: Theory and Practice of Natural Computing

    Quantum Candies and Quantum Cryptography

    J Lin, Tal Mor
    Abstract
    The field of quantum information is becoming more known to the general public. However, effectively demonstrating the concepts underneath quantum science and technology to the general public can be a challenging job. We investigate, extend, and much expand here “quantum candies” (invented by Jacobs), a pedagogical model for intuitively describing some basic concepts inshow more
  • 30 Nov 2020 TPNC 2020: Theory and Practice of Natural Computing

    From Practice to Theory: The "Bright Illumination" Attack on Quantum Key Distribution Systems

    Abstract
    The “Bright Illumination” attack is a practical attack, fully implementable against quantum key distribution systems. In contrast to almost all developments in quantum information processing (for example, Shor’s factorization algorithm, quantum teleportation, Bennett-Brassard (BB84) quantum key distribution, the “Photon-Number Splitting” attack, and many other examples)show more
  • 4 Nov 2020 arXiv

    Super- and subradiance by entangled free particles

    Aviv Karnieli, Nicholas Rivera, Ady Arie, Ido Kaminer
    Abstract
    When multiple quantum emitters radiate, their emission rate may be enhanced or suppressed due to collective interference in a process known as super- or subradiance. Such processes are well-known to occur also in light emission by free charged particles. To date, all experimental and theoretical studies of super- and subradiance in these systems involved the classicalshow more
  • 2 Nov 2020 arXiv

    Shaping Quantum Photonic States Using Free Electrons

    Adi Ben Hayun, Ori Reinhardt, Jonathan Nemirovsky, Aviv Karnieli, Nicholas Rivera, Ido Kaminer
    Abstract
    It is a long-standing goal to generate robust deterministic states of light with unique quantum properties, such as squeezing, sub-Poissonian statistics and entanglement. It is of interest to consider whether such quantum states of light could be generated by exploiting interactions with free electrons, going beyond their already ubiquitous use in generating classicalshow more
  • 1 Nov 2020 arXiv

    Light emission is fundamentally tied to the quantum coherence of the emitting particle

    Aviv Karnieli, Nicholas Rivera, Ady Arie, Ido Kaminer
    Abstract
    Coherent emission of light by free charged particles is ubiquitous in many areas of physics and engineering, with the light's properties believed to be successfully captured by classical electromagnetism in all relevant experimental settings. The advent of interactions between light and free quantum matter waves brought about fundamental questions regarding the role ofshow more
  • 27 Oct 2020 Physical Review X

    Observation of a smooth polaron-molecule transition in a degenerate Fermi gas

    Gal Ness, Constantine Shkedrov, Yanay Florshaim, Oriana K Diessel, Jonas von Milczewski, Richard Schmidt, Yoav Sagi
    Abstract
    Understanding the behavior of an impurity strongly interacting with a Fermi sea is a long-standing challenge in many-body physics. When the interactions are short ranged, two vastly different ground states exist: a polaron quasiparticle and a molecule dressed by the majority atoms. In the single-impurity limit, it is predicted that at a critical interaction strength, ashow more
  • 26 Oct 2020 Physical Review A

    Driving-induced resonance narrowing in a strongly coupled cavity-qubit system

    Eyal Buks, Paul S Brookes, Eran Ginossar, Chunqing Deng, Jean-Luc F X Orgiazzi, Martin Otto, Adrian Lupascu
    Abstract
    We study a system consisting of a superconducting flux qubit strongly coupled to a microwave cavity. Externally applied qubit driving is employed in order to manipulate the spectrum of dressed states. We observe resonance narrowing in the region where the splitting between the two dressed fundamental resonances is tuned to zero. The narrowing in this region of overlappingshow more
  • 12 Oct 2020 Nature Physics

    Resonant phase-matching between a light wave and a free-electron wavefunction

    Abstract
    Quantum light–matter interactions of bound electron systems have been studied extensively. By contrast, quantum interactions of free electrons with light have only become accessible in recent years, following the discovery of photon-induced near-field electron microscopy (PINEM). So far, the fundamental free electron–light interaction in all PINEM experiments has remainedshow more
  • 23 Sep 2020 Nature Reviews Physics

    Light-matter interactions with photonic quasiparticles

    Nicholas Rivera, Ido Kaminer
    Abstract
    Interactions between light and matter play an instrumental role in spectroscopy, sensing, quantum information processing and lasers. In most of these applications, light is considered in terms of electromagnetic plane waves propagating at the speed of light in vacuum. As a result, light–matter interactions can usually be treated as very weak and captured at the lowestshow more
  • 22 Sep 2020 New Journal of Physics

    Sub-wavelength spin excitations in ultracold gases created by stimulated Raman transitions

    Abstract
    Raman transitions are used in quantum simulations with ultracold atoms for cooling, spectroscopy and creation of artificial gauge fields. Spatial shaping of the Raman fields allows local control of the effective Rabi frequency, which can be mapped to the atomic spin. Evanescent Raman fields are of special interest as they can provide a new degree of control emanatingshow more
  • 15 Sep 2020 arXiv

    Continuous measurements for control of superconducting quantum circuits

    Shay Hacohen-Gourgy, Leigh S Martin
    Abstract
    Developments over the last two decades have opened the path towards quantum technologies in many quantum systems, such as cold atoms, trapped ions, cavity-quantum electrodynamics (QED), and circuit-QED. However, the fragility of quantum states to the effects of measurement and decoherence still poses one of the greatest challenges in quantum technology. An imperativeshow more
  • 14 Sep 2020 Nature Communications

    The quantum-optical nature of high harmonic generation

    Abstract
    High harmonic generation (HHG) is an extremely nonlinear effect generating coherent broadband radiation and pulse durations reaching attosecond timescales. Conventional models of HHG that treat the driving and emitted fields classically are usually very successful but inherently cannot capture the quantum-optical nature of the process. Although prior work consideredshow more
  • 14 Sep 2020 OSA Quantum 2.0 Conference (2020), Paper QM5B.4

    Deterministic generation of a cluster-state of indistinguishable entangled photons

    Abstract
    We use periodic excitation of a semiconductor quantum-dot-confined hole to demonstrate gigahertz rate deterministic generation of long strings of entangled indistinguishable photons in a cluster state. The entanglement lasts for 11 consecutive photons.
  • 28 Aug 2020 Nanophotonics

    Scattering of a single plasmon polariton by multiple atoms for in-plane control of light

    Rituraj, Meir Orenstein, Shanhui Fan
    Abstract
    We study the interaction of a single photon in a surface plasmon polariton mode with multiple atoms. We propose a system of two atoms to achieve a tunable scattering from subscattering to superscattering regimes by changing the angle of the incident photon. We also demonstrate a perfect electromagnetically-induced transparency using two atoms with two-level structuresshow more
  • 27 Aug 2020 Journal of Physics: Condensed Matter

    High-T c Cooper-pair injection in a semiconductor-superconductor structure

    Abstract
    We observe Andreev reflection in a YBCO-GaN junction through differential conductance spectroscopy. A strong characteristic zero-bias peak was observed and persisted up to the critical temperature of the superconductor with a smaller superconducting order parameter Δ ∼ 1 meV. The presence of Andreev reflection with the small Δ in comparison to its value for high-T cshow more
  • 24 Aug 2020 Nature Nanotechnology

    Photonic Rashba effect from quantum emitters mediated by a Berry-phase defective photonic crystal

    Abstract
    Heterostructures combining a thin layer of quantum emitters and planar nanostructures enable custom-tailored photoluminescence in an integrated fashion. Here, we demonstrate a photonic Rashba effect from valley excitons in a WSe2 monolayer, which is incorporated into a photonic crystal slab with geometric phase defects, that is, into a Berry-phase defectiveshow more
  • 22 Aug 2020 Active Photonic Platforms XII

    Implications of quantum optics in high harmonic generation

    Abstract
    Effects of extreme nonlinear optics, such as high harmonic generation (HHG), are conventionally modeled with classical electromagnetic fields: both the driving and emitted fields are treated classically. We present the fully quantum electrodynamical theory of extreme nonlinear optics and use it to predict new quantum effects in HHG. The quantum description shows newshow more
  • 20 Aug 2020 ACS Photonics

    Theory of Shaping Electron Wavepackets with Light

    Abstract
    We present the quantum theory governing the interaction between short laser pulses and relativistic free electrons and reveal intrinsic conservation laws for such quantum interactions. Through the judicious design of the amplitude and phase of a laser pulse, we propose the complete shaping of the electron temporal wavepacket and energy spectrum. To exemplify the prospectsshow more
  • 13 Aug 2020 Journal of Magnetic Resonance Open

    Electron spin resonance microfluidics with subnanoliter liquid samples

    Abstract
    Microfluidics is a well-established technique to synthesize, process, and analyze small amounts of materials for chemical, biological, medical, and environmental applications. Typically, it involves the use of reagents with a volume smaller than ~ 1 micro-l—ideally even nano- or picoliters. When the sample of interest contains paramagnetic species, it can in principleshow more
  • 3 Aug 2020 CLEO PR 2020: Pacific Rim Conference on Lasers and Electro-Optics

    Generation of heralded entangled photon combs at telecom wavelength with rubidium Rydberg atom cavity QED

    Abstract
    We proposed a protocol to generate entangled photon-comb pairs using rubidium Rydberg atoms inside an optical cavity. Rydberg blockade isolates a single excitation and the heralding enables non-destructive detection of the presence of photon-pairs.
  • 30 Jul 2020 Nanoscience and Nanotechnology in Security and Protection against CBRN Threats

    Fabrication of Diamond AFM Tips for Quantum Sensing

    Alexander Schmidt, Tzach Jaffe, Meir Orenstein, Johann Peter Reithmaier, Cyril Popov
    Abstract
    Diamond attracts an ever-increasing scientific interest not only due to its outstanding properties, but also as host material for the so-called color centers. In particular, the nitrogen-vacancy (NV) center is a promising candidate for applications in quantum sensing on a nanoscale. Incorporating such centers in sharp diamond tips, allows the fabrication of a controllableshow more
  • 29 Jul 2020 SciPost Physics

    Exponentially long lifetime of universal quasi-steady states in topological Floquet pumps

    Tobias Gulden, Erez Berg, Mark S Rudner, Netanel H Lindner
    Abstract
    We investigate a mechanism to transiently stabilize topological phenomena in long-lived quasi-steady states of isolated quantum many-body systems driven at low frequencies. We obtain an analytical bound for the lifetime of the quasi-steady states which is exponentially large in the inverse driving frequency. Within this lifetime, the quasi-steady state is characterizedshow more
  • 20 Jul 2020 Bulletin of the American Physical Society

    Implementation of a canonical phase measurement with quantum feedback

    Leigh S Martin, William Livingston, Shay Hacohen-Gourgy, Howard M Wiseman, Irfan Siddiqi
    Abstract
    Much of modern metrology and communication technology encodes information in electromagnetic waves, typically as an amplitude or phase. Although current hardware can perform near-ideal measurements of photon number or field amplitude, the ability to perform an ideal phase measurement is still lacking, even in principle. In this work, we implement a single-shot canonicalshow more
  • 15 Jul 2020 Physical Review A

    Two-level quantum system as a macroscopic scatterer for ultraconfined two-dimensional photonic modes

    Rituraj, Meir Orenstein, Shanhui Fan
    Abstract
    We study the scattering of a single photon in the surface plasmon polariton mode propagating on a two-dimensional surface, by a two-level quantum system in the regime where the photon wavelength becomes comparable or smaller than the size of the electron wave function. In this interesting regime, the scattering spectral signature becomes highly dependent on the shapeshow more
  • 14 Jul 2020 Physical Review Letters

    PT-Symmetric Topological Edge-Gain Effect

    Alex Y Song, Xiao-Qi Sun, Avik Dutt, Momchil Minkov, Casey Wojcik, Haiwen Wang, Ian A D Williamson, Meir Orenstein, Shanhui Fan
    Abstract
    We demonstrate a non-Hermitian topological effect that is characterized by having complex eigenvalues only in the edge states of a topological material, despite the fact that the material is completely uniform. Such an effect can be constructed in any topological structure formed by two gapped subsystems, e.g., a quantum spin-Hall system, with a suitable non-Hermitianshow more
  • 6 Jul 2020 Physical Review Applied

    Single-exposure absorption imaging of ultracold atoms using deep learning

    Abstract
    Absorption imaging is the most common probing technique in experiments with ultracold atoms. The standard procedure involves the division of two frames acquired at successive exposures, one with the atomic absorption signal and one without. A well-known problem is the presence of residual structured noise in the final image, due to small differences between the imagingshow more
  • 6 Jun 2020 arXiv

    Quantum Communication -- Celebrating the Silver Jubilee of Teleportation

    Abstract
    In 1993, Charles H. Bennett, Gilles Brassard, Claude Crépeau, Richard Jozsa, Asher Peres, and William K. Wootters published their seminal paper presenting quantum teleportation, titled “Teleporting an unknown quantum state via dual classical and Einstein–Podolsky–Rosen channels” [1]. Their paper presents and answers the question “Can we transmit an unknown quantum stateshow more
  • 3 Jun 2020 Physical Review B

    Towards supersensitive optical phase measurement using a deterministic source of entangled multiphoton states

    Abstract
    Precision measurements of optical phases have many applications in science and technology. Entangled multiphoton states have been suggested for performing such measurements with precision that significantly surpasses the shot-noise limit. Until recently, such states have been generated mainly using spontaneous parametric down-conversion—a process which is intrinsicallyshow more
  • 3 Jun 2020 arXiv

    Coherent interaction between free electrons and a photonic cavity

    Abstract
    Advances in the research of interactions between ultrafast free electrons and light have introduced a previously unknown kind of quantum matter, quantum free-electron wavepackets. So far, studies of the interactions of cavity-confined light with quantum matter have focused on bound electron systems, such as atoms, quantum dots and quantum circuits, which are considerablyshow more
  • 25 May 2020 Nature Physics

    Tunable bandgap renormalization by nonlocal ultra-strong coupling in nanophotonics

    Abstract
    In quantum optics, great effort is being invested in enhancing the interaction of quantum emitters with light. The different approaches include increasing the number of emitters, the laser intensity or the local photonic density of states at the location of an atom-like localized emitter. In contrast, solid-state extended emitters hold an unappreciated promise of vastlyshow more
  • 15 May 2020 CLEO: Applications and Technology 2020

    Design and Fundamental Limits of Nearfield Magnetic-Force Scanning Microscopy via the No-Cloning Theorem

    Abstract
    We analyze nearfield measurements of magnetic fields originating from quantum sources and measured by quantum probes. We show that cloning-inspired techniques reveal optimal measurement schemes and new universal precision bounds for nearfield detectors.
  • 15 May 2020 2020 Conference on Lasers and Electro-Optics (CLEO)

    Quantum Walk with Coherent Uncertainty in Electron-Laser Interaction

    Abstract
    We show that pulsed laser-driven free electrons undergo quantum walk with coherent uncertainty in the electron energy levels, characterized by their spread. We study this quantum walk experimentally and develop its analytic theory.
  • 15 May 2020 CLEO: QELS_Fundamental Science 2020

    Free Electron Cavity Quantum Electrodynamics in an Ultrafast Electron Microscope

    Abstract
    We observe an increased interaction strength and time between quantum electron wavepackets and laser pulses due to the large Q-factor of a photonic crystal slab, promoting the integration of free-electron emitters into cavity quantum electrodynamics.
  • 15 May 2020 Conference on Lasers and Electro Optics

    Topologically Protected Path-Entangled Photonic States

    Andrea Blanco-Redondo, Michelle Wang, Cooper Doyle, Bryn Bell, Matthew J Collins, Eric Magi, Benjamin J Eggleton, Mordechai Segev
    Abstract
    We report our experimental results on topologically protected path-entangled photonic states using dimer chains in silicon photonics. These results highlight the potential of the lattice topology to protect photonic quantum information.
  • 1 May 2020 Nano Letters

    Novel Ultra Localized and Dense Nitrogen Delta-Doping in Diamond for Advanced Quantum Sensing

    Abstract
    We introduce and demonstrate a new approach for nitrogen-vacancy (NV) patterning in diamond, achieving a deterministic, nanometer-thin, and dense delta-doped layer of negatively charged NV centers in diamond. We employed a pure nitridation stage using microwave plasma and a subsequent in situ diamond overgrowth. We present the highest reported nitrogen concentration inshow more
  • 27 Apr 2020 Nature Nanotechnology

    Probing nanoscale fluctuation of ferromagnetic meta-atoms with a stochastic photonic spin Hall effect

    Abstract
    The photonic spin Hall effect, a deep subdiffraction-limited shift between the opposite spin components of light, emerges when light undergoes an evolution of polarization or trajectory that induces the geometric phase. Here, we study a stochastic photonic spin Hall effect arising from space-variant Berry-Zak phases, which are generated by disordered magneto-opticalshow more
  • 12 Mar 2020 New Journal of Physics

    Learning the dynamics of open quantum systems from their steady states

    Eyal Bairey, Chu Guo, Dario Poletti, Netanel H Lindner, Itai Arad
    Abstract
    Recent works have shown that generic local Hamiltonians can be efficiently inferred from local measurements performed on their eigenstates or thermal states. Realistic quantum systems are often affected by dissipation and decoherence due to coupling to an external environment. This raises the question whether the steady states of such open quantum systems containshow more