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28 Apr 2023 • Journal Article • Physical Review B
Universal photonic quantum gate by Cooper-pair-based optical nonlinearity
AbstractWe propose a compact and highly efficient scheme for solid-state photonic quantum gates. At the core of our scheme is a gate based on giant Cooper-pair-based optical nonlinearity we predict in a semiconductor-superconductor structure, selectively
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24 Apr 2023 • Preprint • arXiv
Low-energy Free-electron Rabi oscillation and its applications
AbstractWe propose free-electron Rabi oscillation by creating an isolated two-level system in a synthetic energy space induced by laser. The {\pi}/2-pulse and {\pi}-pulse in synthetic Rabi dynamics can function as 'beam splitters' and 'mirrors' for free-electron interferometry, allowing us to detect local electromagnetic fields and plasmonic excitations. When the coupling field
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20 Apr 2023 • Journal Article • New Journal of Physics
Cyclotron Radiation from Shaped Electron Wavefunctions
AbstractRecent years have shown increasing interest in understanding the role of the wavefunction of a quantum source on the characteristics of its emitted radiation. In this work, we demonstrate that shaping the wavefunction of the source can drastically change the instantaneous emission. We exemplify this concept by examining an electron in cyclotron motion, calculating the
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18 Apr 2023 • Preprint • arXiv
Defects in Graphene : A Topological Description
AbstractSpecific types of spatial defects or potentials can turn monolayer graphene into a topological material. These topological defects are classified by a spatial dimension $D$ and they are systematically obtained from the Hamiltonian by means of its symbol $\mathcal{H} (\boldsymbol{k}, \boldsymbol{r}) $, an operator which generalises the Bloch Hamiltonian and contains all
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11 Apr 2023 • Journal Article • Physical Review B
Superconductivity and fermionic dissipation in quantum Hall edges
AbstractProximity-induced superconductivity in fractional quantum Hall edges is a prerequisite to proposed realizations of parafermion zero modes. A recent experimental work [Gül et al., Phys. Rev. X 12, 021057 (2022)] provided evidence for such coupling, in the form of a crossed Andreev reflection signal, in which electrons enter a superconductor from one chiral mode and are
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9 Apr 2023 • Preprint • arXiv
Tunable multimode lasing in a fiber ring
AbstractWe experimentally study a fiber loop laser with an integrated Erbium doped fiber (EDF). The output optical spectrum is measured as a function of the EDF temperature. We find that below a critical temperature of about 10K the measured optical spectrum exhibits a sequence of narrow and unequally-spaced peaks. Externally injected light and filtering are employed for tuning
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31 Mar 2023 • Journal Article • IEEE Transactions on Quantum Engineering
Security Proof Against Collective Attacks for an Experimentally Feasible Semiquantum Key Distribution Protocol
AbstractSemiquantum key distribution (SQKD) allows two parties (Alice and Bob) to create a shared secret key, even if one of these parties (say, Alice) is classical. However, most SQKD protocols suffer from severe practical security problems when implemented using photons. The recently developed “Mirror protocol” [1] is an experimentally feasible SQKD protocol overcoming those
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24 Mar 2023 • Journal Article • Physical Review Letters
Self-Consistent Extraction of Spectroscopic Bounds on Light New Physics
AbstractFundamental physical constants are determined from a collection of precision measurements of elementary particles, atoms, and molecules. This is usually done under the assumption of the standard model (SM) of particle physics. Allowing for light new physics (NP) beyond the SM modifies the extraction of fundamental physical constants. Consequently, setting NP bounds
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23 Mar 2023 • Preprint • arXiv
Free-electron interactions with photonic GKP states: universal control and quantum error correction
AbstractWe show that the coherent interaction between free electrons and photons can be used for universal control of continuous-variable photonic quantum states in the form of Gottesman-Kitaev-Preskill (GKP) qubits. Specifically, we find that electron energy combs enable non-destructive measurements of the photonic state and can induce arbitrary gates. Moreover, a single
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23 Mar 2023 • Preprint • arXiv
Universal and ultrafast quantum computation based on free-electron-polariton blockade
AbstractCavity quantum electrodynamics (QED), wherein a quantum emitter is coupled to electromagnetic cavity modes, is a powerful platform for implementing quantum sensors, memories, and networks. However, due to the fundamental tradeoff between gate fidelity and execution time, as well as limited scalability, the use of cavity-QED for quantum computation was overtaken by other
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