A5024833062- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Quantum Information and Cryptography
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Acoustic Wave Resonator Technologies
- Magnetic confinement fusion research
- Advanced ceramic materials synthesis
- Nonlinear Photonic Systems
- Gyrotron and Vacuum Electronics Research
- Photonic and Optical Devices
- Quantum Computing Algorithms and Architecture
- Fusion materials and technologies
- Advanced Condensed Matter Physics
- Advanced Fiber Laser Technologies
- Quantum Mechanics and Applications
- Plasma Diagnostics and Applications
- Ionosphere and magnetosphere dynamics
- Spectral Theory in Mathematical Physics
- Optical and Acousto-Optic Technologies
- Photorefractive and Nonlinear Optics
- Laser-Plasma Interactions and Diagnostics
- Advanced Frequency and Time Standards
- Superconducting and THz Device Technology
National Institute of Standards and Technology
2023-2024
University of Colorado Boulder
2023-2024
Université Paris-Saclay
2020-2024
University of Colorado System
2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2019-2023
CEA Paris-Saclay
2019-2023
Service de Physique de l'État Condensé
2019-2023
Centre National de la Recherche Scientifique
2020-2023
Institut Rayonnement-Matière de Saclay
2020-2022
Culham Science Centre
2018
We performed microwave spectroscopy of an InAs nanowire between superconducting contacts implementing a finite-length, multichannel Josephson weak link. Certain features in the spectra, such as splitting by spin-orbit interactions transition lines among Andreev states, have been already understood terms noninteracting models. However, we identify here additional transitions, which evidence presence Coulomb interactions. By combining experimental measurements and model calculations, reach...
We perform microwave spectroscopy of Andreev states in superconducting weak links tailored an InAs-Al (core-full shell) epitaxially grown nanowire. The spectra present distinctive features with bundles four lines crossing when the phase difference across link is 0 or π. interpret these as arising from zero-field spin-split states. A simple analytical model, which takes into account Rashba spin-orbit interaction a nanowire containing several transverse subbands, explains and their evolution...
Spectral properties of a quantum circuit are efficiently read out by monitoring the resonance frequency shift it induces in microwave resonator coupled to it. When two systems strongly detuned, theory attributes an effective capacitance or inductance that depends on state. At small detuning, arises from exchange virtual photons, as described Jaynes-Cummings model. Here we present bridging these limits and illustrate, with several examples, its necessity for general description circuits readout.
The dielectric loss of silicon nitride (${\mathrm{Si}}_{3}{\mathrm{N}}_{4}$) limits the performance microwave-frequency devices that rely on this material for sensing, signal processing, and quantum communication. Using superconducting resonant circuits, we measure cryogenic tangent either as-deposited or high-temperature annealed stoichiometric ${\mathrm{Si}}_{3}{\mathrm{N}}_{4}$ as a function drive strength temperature. internal behavior electrical resonators is largely consistent with...
The design and operation of future fusion devices relying on H-mode plasmas requires reliable modelling edge-localized modes (ELMs) for precise prediction divertor target conditions. An extensive experimental validation simple analytical predictions the time evolution plasma loads during ELMs has been carried out here in more than 70 JET-ITER-like wall experiments with a wide range Comparisons these diagnostic measurements ion flux density, power impact energy electron temperature are...
By coupling a superconducting weak link to microwave resonator, recent experiments probed the spectrum and achieved quantum manipulation of Andreev states in various systems. However, quantitative understanding response resonator changes occupancy levels, which are fermionic nature, is missing. Here, using Bogoliubov-de Gennes formalism describe general formulation we calculate shift frequency as function levels how transitions induced by phase or electric field drives. We apply this analyze...
We explore the effects of driving a cavity at large photon number in circuit-QED experiment where “matterlike” part corresponds to unique Andreev level superconducting weak link. The three many-body states link, corresponding occupation by 0, 1, or 2 quasiparticles, lead different frequency shifts. show how nonlinearity inherited from its coupling link affects state discrimination and calibration. Both require treating evolution driven system beyond dispersive limit. In addition, we observe...
Piezoelectric phononic crystal resonators (PCRs) are a promising platform for acoustic quantum processing, yet their performance is currently limited by coupling to an ensemble of saturable two-level system (TLS) defects within the resonator material. Motivated its excellent bulk mechanical properties and high crystallinity, we address this fabricating PCRs from new substrate: thin-film quartz. At single-phonon powers millikelvin temperatures -- requisite conditions processing demonstrate...
This paper presents the results of fluctuation measurements in a toroidal magnetized plasma, using Langmuir probes, and comparisons between observed frequency modes Hasegawa-Wakatani model including curvature, adapted to specifics device. More precisely, two kinds signals are detected presence an additional vertical magnetic field region significant density potential gradients. A high frequency, propagating component, corresponding dissipative drift-waves curved field, is typical wavelengths...
We explore the effects of driving a cavity at large photon number in circuit-QED experiment where ``matter-like'' part corresponds to an unique Andreev level superconducting weak link. The three many-body states link, corresponding occupation by 0, 1 or 2 quasiparticles, lead different frequency shifts. show how non-linearity inherited from its coupling link affects state discrimination and calibration. Both require treating evolution driven system beyond dispersive limit. In addition, we...
The dielectric loss of silicon nitride (Si$_3$N$_4$) limits the performance microwave-frequency devices that rely on this material for sensing, signal processing, and quantum communication. Using superconducting resonant circuits, we measure cryogenic tangent either as-deposited or high-temperature annealed stoichiometric Si$_3$N$_4$ as a function drive strength temperature. internal behavior electrical resonators is largely consistent with standard tunneling model two-level systems (TLS),...
The mitigation of target heat load in future steady state fusion devices will require dissipation a significant amount power through radiation.Plasma operations relying on ELMy H-modes could be problematic since ELMs may transport substantial amounts to the without dissipation.Therefore, estimation average ELM exhaust from plasma core is crucial evaluate potential limitation H-mode regime.A series more than 50 JET with ITER-Like Wall (JET-ILW) discharges wide range conditions has been used...