W. Clarke Smith
A5071597247- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Quantum and electron transport phenomena
- Neural Networks and Reservoir Computing
- Mechanical and Optical Resonators
- Advancements in Semiconductor Devices and Circuit Design
- Quantum many-body systems
- Quantum Mechanics and Applications
- Semiconductor materials and devices
- Quantum optics and atomic interactions
- Advanced Data Storage Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Materials Characterization Techniques
- Algebraic structures and combinatorial models
- Advanced Thermodynamics and Statistical Mechanics
- Theoretical and Computational Physics
- Antenna Design and Analysis
- Computational Physics and Python Applications
- Quantum-Dot Cellular Automata
- Acoustic Wave Resonator Technologies
- Computational Geometry and Mesh Generation
- Laser Design and Applications
- Photonic and Optical Devices
- Random lasers and scattering media
- RFID technology advancements
Google (United States)
2022-2025
Sorbonne Université
2024
Université Paris Sciences et Lettres
2024
Centre National de la Recherche Scientifique
2024
École Normale Supérieure - PSL
2024
University of California, Riverside
2022
Yale University
2016-2018
MesoScribe Technologies (United States)
2013
Current implementations of quantum bits (qubits) continue to undergo too many errors be scaled into useful machines. An emerging strategy is encode information in the two meta-stable pointer states an oscillator exchanging pairs photons with its environment, a mechanism shown provide stability without inducing decoherence. Adding these increases their separation, and macroscopic bit-flip times are expected even for handful photons, range suitable implement qubit. However, previous...
We demonstrate a high dynamic range Josephson parametric amplifier (JPA) in which the active nonlinear element is implemented using an array of rf-SQUIDs. The device matched to 50 Ω environment with Klopfenstein-taper impedance transformer and achieves bandwidth 250–300 MHz input saturation powers up −95 dBm at 20 dB gain. A 54-qubit Sycamore processor was used benchmark these devices, providing calibration for readout power, estimation added noise, platform comparison against standard...
The interaction strength of an oscillator to a qubit grows with the oscillator's vacuum field fluctuations. well known degenerate parametric has revived interest in regime strongly detuned squeezing, where its eigenstates are squeezed Fock states. Owing these amplified fluctuations, it was recently proposed that squeezing this would dynamically boost qubit-photon interactions. In superconducting circuit experiment, we observe two-fold increase dispersive between and at 5.5 dB demonstrating...
We present a method for calculating the energy levels of superconducting circuits that contain highly anharmonic, inductively shunted modes with arbitrarily strong coupling. Our starts by normal linearized circuit and proceeds numerical diagonalization in this basis. As an example, we analyze Hamiltonian fluxonium qubit coupled to readout resonator. While elementary, simple example is nontrivial because it cannot be efficiently treated known as ``black-box quantization,'' bare harmonic...
A central requirement for any quantum error correction scheme is the ability to perform nondemolition measurements of an syndrome, corresponding a special symmetry property encoding scheme. It in particular important that such measurement does not introduce extra mechanisms, included model In this Letter, we ensure robustness by designing interaction with device preserves degeneracy measured observable. More precisely, propose continuous and photon-number parity microwave cavity. This...
Quantum computing hardware is much more susceptible to errors than classical hardware. While quantum error correction can combat these errors, the noise affecting must be understood apply proper error-correcting code. Presenting an approach for determining in real time whether qubit are correlated, authors simultaneously monitor two fluxonium qubits and measure correlations between their relaxation times. This analysis method architecture generalized multiqubit systems, where applying right...
Superconducting artificial atoms are an emerging platform for the study of coherent quantum physics, and computation. However, their level-transition properties currently much simpler than those true atoms, which limits systems that can be implemented with this hardware. Here researchers use a nonlinear coupling element to engineer selection rules fluxonium circuit, thus gain access previously forbidden transitions. Such technique allows us expand set operations possible using...
This paper presents a wafer-level integrated SAW sensor that uses conventional thin-film fabrication for the SAW, and direct write of thicker dissimilar metal antenna. An automated thermal spray process deposits antenna conductor onto substrate, providing ease fabrication, optimal film thickness, superior adhesion, application specific materials. Results will highlight printing thick copper traces whole LiNbO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The capability to perform parity-type measurements is a central ingredient of any fault-tolerant quantum computation architecture with protected qubits. We propose schemes achieve continuous and non-demolition class observables for the so-called cat-qubits. While opening new perspectives towards information processing superconducting circuits, this work also explores regime non-linear interactions provided by high-impedance Josephson circuit.
We demonstrate a high dynamic range Josephson parametric amplifier (JPA) in which the active nonlinear element is implemented using an array of rf-SQUIDs. The device matched to 50 $Ω$ environment with Klopfenstein-taper impedance transformer and achieves bandwidth 250-300 MHz, input saturation powers up -95 dBm at 20 dB gain. A 54-qubit Sycamore processor was used benchmark these devices, providing calibration for readout power, estimate added noise, platform comparison against standard...