A5042266456- Quantum Information and Cryptography
- Quantum and electron transport phenomena
- Physics of Superconductivity and Magnetism
- Mechanical and Optical Resonators
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Computing Algorithms and Architecture
- Photonic and Optical Devices
- Quantum optics and atomic interactions
- Semiconductor Quantum Structures and Devices
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Advanced Electrical Measurement Techniques
- Quantum Mechanics and Applications
- Strong Light-Matter Interactions
- Quantum many-body systems
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Fiber Laser Technologies
- Quantum, superfluid, helium dynamics
- Optical Network Technologies
- Astrophysics and Cosmic Phenomena
- High-pressure geophysics and materials
- Cosmology and Gravitation Theories
- Nonlinear Photonic Systems
- Seismic Waves and Analysis
- Precipitation Measurement and Analysis
Centre National de la Recherche Scientifique
2019-2023
Université Grenoble Alpes
2019-2023
Institut Néel
2019-2023
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro
2023
Institut polytechnique de Grenoble
2019-2022
Scuola Normale Superiore
2016
Istituto Nanoscienze
2016
An amplifier combining noise performances as close possible to the quantum limit with large bandwidth and high saturation power is highly desirable for many solid state technologies such fidelity qubit readout or sensitivity electron spin resonance example. Here we introduce a new Traveling Wave Parametric Amplifier based on Superconducting QUantum Interference Devices. It displays 3 GHz bandwidth, -102 dBm 1-dB compression point added near limit. Compared previous state-of-the-art, it an...
Coupling an isolated emitter to a single mode of the electromagnetic field is now routinely achieved and well understood. Current efforts aim explore coherent dynamics emitters coupled several modes (EM). freedom. Recently, ultrastrong coupling transmission line has been where resonance broadens significant fraction its frequency. In this work we gain significantly improved control over regime. We do so by combining simplicity transmon qubit bespoke EM environment with high density discrete...
Quantum-limited microwave parametric amplifiers are genuine key pillars for rising quantum technologies and in general applications that rely on the successful readout of weak signals by adding only minimum amount noise allowed mechanics. In this perspective, after providing a brief overview different families amplifiers, we focus traveling wave (TWPAs), underlining achievements last years present open challenges. We discuss also possible new research directions beyond amplification such as...
Josephson meta-materials have recently emerged as very promising platform for superconducting quantum science and technologies. Their distinguishing potential resides in ability to engineer them at sub-wavelength scales, which allows complete control over wave dispersion nonlinear interaction. In this article we report a versatile transmission line with strong third order nonlinearity can be tuned from positive negative values, suppressed second non linearity. As an initial implementation of...
Traveling wave parametric amplifiers (TWPAs) have recently emerged as essential tools for broadband near quantum-limited amplification. However, their use to generate microwave quantum states still misses an experimental demonstration. In this Letter, we report operation of a TWPA source two-mode squeezed radiation. We demonstrate entanglement generation between two modes separated by up 400 MHz measuring logarithmic negativity 0.27 and 0.51 collective quadrature squeezing below the vacuum...
Electromagnetic fields possess zero point fluctuations (ZPF) which lead to observable effects such as the Lamb shift and Casimir effect. In traditional quantum optics domain, these corrections remain perturbative due smallness of fine structure constant. To provide a direct observation non-perturbative driven by ZPF in an open system we wire highly non-linear Josephson junction high impedance transmission line, allowing large phase across junction. Consequently, resonance former acquires...
A new qubit readout scheme preserves quantum state probabilities while maximizing fidelity with a fast time, thus providing robust measurement method for generation of superconducting processors.
A traveling wave parametric amplifier has been integrated in the haloscope of QUAX experiment. search for dark matter axions performed with a high-$Q$ dielectric cavity immersed an 8 T magnetic field and read by detection chain having system noise temperature about 2.1 K at frequency 10.353 GHz. Scanning conducted varying using sapphire rods into cavity. At multiple operating frequencies, sensitivity instrument was level viable axion models.
Determining the state of a qubit on time scale much shorter than its relaxation is an essential requirement for quantum information processing. With aid nondegenerate parametric amplifier, we demonstrate continuous detection jumps transmon with $90\mathrm{%}$ fidelity discrimination. Entirely fabricated by standard two-step optical-lithography techniques, this type amplifier consists dispersion-engineered Josephson-junction (JJ) array. By using long arrays, containing...
Superconducting traveling-wave parametric amplifiers (TWPAs) are increasingly used in various applications, including quantum computing, sensing, and dark matter detection. However, one important characteristic of these amplifiers, gain compression, has not received much attention. As a result, there is lack comprehensive experimental exploration this phenomenon the existing literature. In study, we present an investigation compression Josephson amplifier based on four-wave mixing process....
We developed a versatile integrated control and readout instrument for experiments with superconducting quantum bits (qubits), based on field-programmable gate array (FPGA) platform. Using this platform, we perform measurement-based, closed-loop feedback operations $428 \, \mathrm{ns}$ platform latency. The capability is instrumental in realizing active reset initialization of the qubit into ground state time much shorter than its energy relaxation $T_1$. show experimental results...
In this paper we will describe the characterisation of a rf detection chain based on travelling wave parametric amplifier (TWPA). The is meant to be used for dark matter axion searches and thus it mounted coupled high Q microwave resonant cavity. A system noise temperature $T_{\rm sys} = (3.3 \pm 0.1$) K has been measured at frequency 10.77 GHz, using novel scheme allowing measurement $ exactly cavity output port.
In recent decades, the laws of thermodynamics have been pushed down to smaller and scales, within theoretical field stochastic state-of-the-art experiments performed on microfabricated mesoscopic systems. These measurements concern thermal properties electrons, photons, mechanical objects. Here we report fluctuations a single mode in equilibrium with heat reservoir. The device under study is nanomechanical beam first flexural resonating at $3.8\phantom{\rule{0.16em}{0ex}}\mathrm{MHz}$,...
We report on the implementation and detailed modelling of a Josephson Parametric Amplifier (JPA) made from an array eighty Superconducting QUantum Interference Devices (SQUIDs), forming non-linear quarter-wave resonator. This device was fabricated using very simple single step fabrication process. It shows large bandwidth (45 MHz), operating frequency tunable between 5.9 GHz 6.8 input saturation power (-117 dBm) when biased to obtain 20 dB gain. Despite length SQUID being comparable...
We present 3D calculations for dielectric haloscopes such as the currently envisioned MADMAX experiment. For ideal systems with perfectly flat, parallel and isotropic disks of finite diameter, we find that a geometrical form factor reduces emitted power by up to $30\,\%$ compared earlier 1D calculations. derive beam shape, which is important antenna design. show realistic dark matter axion velocities $10^{-3} c$ inhomogeneities external magnetic field at scale $10\,\%$ have negligible impact...
We investigate the effect of magnetic field on a photonic-crystal Josephson traveling-wave parametric amplifier (TWPA). show that observed change in photonic bandgap and plasma frequency TWPA can be modeled by considering suppression critical current junctions (JJs) due to Fraunhofer closing superconducting gap. Accounting for JJ geometry is crucial understanding dependence. In one in-plane direction, shifted 2 GHz using up 60 mT field, without losing gain or bandwidth, showing TWPAs SQUIDs...
Abstract Traveling wave parametric amplifiers (TWPAs) are extensively employed in experiments involving weak microwave signals for their highly desirable quantum-limited and broadband characteristics. However, TWPAs’ nature comes with the disadvantage of admitting activation spurious nonlinear processes, such as harmonics generation, that can potentially degrade amplification performance. Here we experimentally investigate a Josephson TWPA device superconducting asymmetric inductive...
Fast discrimination between quantum states of superconducting artificial atoms is an important ingredient for information processing. In circuit electrodynamics, increasing the signal-field amplitude in readout resonator, dispersively coupled to atom, improves signal-to-noise ratio and increases measurement strength. Here, we employ this effect over 2 orders magnitude power, made possible by unique combination a dimer-Josephson-junction-array amplifier with large dynamic range fact that our...
Traveling Wave Parametric Amplifiers (TWPAs) are extensively employed in experiments involving weak microwave signals for their highly desirable quantum-limited and broadband characteristics. However, TWPAs' nature comes with the disadvantage of admitting activation spurious nonlinear processes, such as harmonics generation, that can potentially degrade amplification performance. Here we experimentally investigate a Josephson TWPA device SNAIL (Superconducting Nonlinear Asymmetric Inductive...
We report on the fabrication and characterization of 50 Ohms, flux-tunable, low-loss, SQUID-based transmission lines. The process relies deposition a thin dielectric layer (few tens nanometers) via Atomic Layer Deposition (ALD) top SQUID array, whole structure is then covered by non-superconducting metallic ground plane. present experimental results from five different samples. systematically characterize their microscopic parameters measuring propagating phase in these structures. also...