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26 Mar 2025 • Journal Article • The European Physical Journal D
Muonium fine structure: theory update, tests of Lorentz violation, and experimental prospects
AbstractWe review the status of the QED calculations for the muonium \(2S_{1/2}-2P_{3/2}\) energy interval and provide the updated theoretical value of 9874.357(1)\({\,{\textrm{MHz}}\,}\). Additionally, we present a model for probing Lorentz-violating coefficients within the Standard Model Extension framework using the fine structure measurement in the presence and absence of
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21 Mar 2025 • Preprint • arXiv
On the Importance of Error Mitigation for Quantum Computation
AbstractQuantum error mitigation (EM) is a family of hybrid quantum-classical methods for eliminating or reducing the effect of noise and decoherence on quantum algorithms run on quantum hardware, without applying quantum error correction (EC). While EM has many benefits compared to EC, specifically that it requires no (or little) qubit overhead, this benefit comes with a
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20 Mar 2025 • Journal Article • Optica
Toward high-gain laser-driven electron undulators
AbstractFree-electron laser (FEL) is a powerful tool that provides high-brightness radiation across a wide range of frequencies up to the x-ray spectrum. However, the large size and high cost of FEL facilities have limited their accessibility and widespread adoption. To address this challenge, researchers have explored the possibility of replicating FEL physics using lasers
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18 Mar 2025 • Preprint • arXiv
Roadmap for Quantum Nanophotonics with Free Electrons
AbstractOver the past century, continuous advancements in electron microscopy have enabled the synthesis, control, and characterization of high-quality free-electron beams. These probes carry an evanescent electromagnetic field that can drive localized excitations and provide high-resolution information on material structures and their optical responses, currently reaching the
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17 Mar 2025 • Journal Article • Physical Review B
Magneto-optics of a charge-tunable quantum dot: Observation of a negative diamagnetic shift
AbstractWe present magneto-optical studies of a self-assembled semiconductor quantum dot in neutral and positively charged states. The diamagnetic shifts and Zeeman splitting of many well-identified optical transitions are precisely measured. Remarkably, a pronounced negative diamagnetic shift is observed for spectral lines resulting from a doubly positively charged excitonic
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16 Mar 2025 • Preprint • arXiv
Robust strong-field theory model for ultrafast electron transport through metal-insulator-metal tunneling nanojunctions
AbstractUltrafast science studies the dynamics of electrons in matter with extreme temporal precision, typically in the attosecond and femtosecond time domain. Recent experimental and theoretical progress has put metal-insulator-metal (MIM) tunneling nanojunctions in the spotlight of ultrafast science. Waveform-controlled laser fields can induce ultrafast currents in these
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15 Mar 2025 • Preprint • arXiv
Tunable N-level EIT: Deterministic Generation of Optical States with Negative Wigner Function
AbstractStrong optical nonlinearities are key to a range of technologies, particularly in the generation of photonic quantum states. The strongest nonlinearity in hot atomic vapors originates from electromagnetically induced transparency (EIT), which, while effective, often lacks tunability and suffers from significant losses due to atomic absorption. We propose and demonstrate
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13 Mar 2025 • Journal Article • Npj Quantum Materials
Topological excitations at time vortices in periodically driven systems
AbstractWe consider two-dimensional periodically driven systems of fermions with particle-hole symmetry. Such systems support non-trivial topological phases, including ones that cannot be realized in equilibrium. We show that a space-time defect in the driving Hamiltonian, dubbed a “time vortex,” can bind π Majorana modes. A time vortex is a point in space around which the
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7 Mar 2025 • Journal Article • Journal of High Energy Physics
New physics at the Muon (Synchrotron) Ion Collider: MuSIC for several scales
AbstractA Muon (Synchrotron) Ion Collider (MuSIC) can be the successor to the Electron-Ion Collider at Brookhaven National Laboratory, as well as the ideal demonstrator facility for a future multi-TeV Muon Collider. Besides its rich nuclear physics and Standard Model particle physics programs, in this work we show that the MuSIC with a TeV-scale muon beam offers also a unique
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6 Mar 2025 • Preprint • arXiv
Nonlinear Nanophotonics for High-Dimensional Quantum States
AbstractQuantum nanophotonics merges the precision of nanoscale light manipulation with the capabilities of quantum technologies, offering a pathway for enhanced light-matter interaction and compact realization of quantum devices. Here, we show how a recently-demonstrated nonlinear nanophotonic process can be employed to selectively create photonic high-dimensional quantum
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