A5027626662- Particle physics theoretical and experimental studies
- Quantum Computing Algorithms and Architecture
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Quantum Information and Cryptography
- Advancements in Semiconductor Devices and Circuit Design
- Quantum and electron transport phenomena
- Quantum many-body systems
- Semiconductor materials and devices
- Particle Detector Development and Performance
- Neural Networks and Reservoir Computing
- Advanced Data Storage Technologies
- Distributed and Parallel Computing Systems
- Silicon Carbide Semiconductor Technologies
- Physics of Superconductivity and Magnetism
- Quantum-Dot Cellular Automata
- Quantum Mechanics and Applications
- Computational Physics and Python Applications
- Astrophysics and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Parallel Computing and Optimization Techniques
- Quantum optics and atomic interactions
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Advanced Thermodynamics and Statistical Mechanics
Google (United States)
2019-2025
University of California, Riverside
2022
National Taiwan University
1996-2014
IBM (United States)
2009
Institute of Physics, Academia Sinica
2000-2005
University of Florida
1993-2005
Motorola (United States)
2003
Children's Defense Fund
1998-2002
Istituto Nazionale di Fisica Nucleare
2000-2002
University of Bologna
2000-2002
As the search continues for useful applications of noisy intermediate scale quantum devices, variational simulations fermionic systems remain one most promising directions. Here, we perform a series chemistry largest which involved dozen qubits, 78 two-qubit gates, and 114 one-qubit gates. We model binding energy ${\rm H}_6$, H}_8$, H}_{10}$ H}_{12}$ chains as well isomerization diazene. also demonstrate error-mitigation strategies based on $N$-representability dramatically improve effective...
The discovery of topological order has revolutionized the understanding quantum matter in modern physics and provided theoretical foundation for many error correcting codes. Realizing topologically ordered states proven to be extremely challenging both condensed synthetic systems. Here, we prepare ground state toric code Hamiltonian using an efficient circuit on a superconducting processor. We measure entanglement entropy near expected value $\ln2$, simulate anyon interferometry extract...
Realizing the potential of quantum computing requires sufficiently low logical error rates1. Many applications call for rates as 10-15 (refs. 2-9), but state-of-the-art platforms typically have physical near 10-3 10-14). Quantum correction15-17 promises to bridge this divide by distributing information across many qubits in such a way that errors can be detected and corrected. Errors on encoded qubit state exponentially suppressed number grows, provided are below certain threshold stable...
Quantum algorithms offer a dramatic speedup for computational problems in material science and chemistry. However, any near-term realizations of these will need to be optimized fit within the finite resources offered by existing noisy hardware. Here, taking advantage adjustable coupling gmon qubits, we demonstrate continuous two-qubit gate set that can provide threefold reduction circuit depth as compared standard decomposition. We implement two families: an imaginary swap-like (iSWAP-like)...
Abstract Quantum many-body systems display rich phase structure in their low-temperature equilibrium states 1 . However, much of nature is not thermal equilibrium. Remarkably, it was recently predicted that out-of-equilibrium can exhibit novel dynamical phases 2–8 may otherwise be forbidden by thermodynamics, a paradigmatic example being the discrete time crystal (DTC) 7,9–15 Concretely, defined periodically driven many-body-localized (MBL) via concept eigenstate order 7,16,17 In...
Interaction in quantum systems can spread initially localized information into the many degrees of freedom entire system. Understanding this process, known as scrambling, is key to resolving various conundrums physics. Here, by measuring time-dependent evolution and fluctuation out-of-time-order correlators, we experimentally investigate dynamics scrambling on a 53-qubit processor. We engineer circuits that distinguish two mechanisms associated with operator spreading entanglement, observe...
We demonstrate diabatic two-qubit gates with Pauli error rates down to $4.3(2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ in as fast 18 ns using frequency-tunable superconducting qubits. This is achieved by synchronizing the entangling parameters minima leakage channel. The synchronization shows a landscape gate parameter space that agrees model predictions and facilitates robust tune-up. test both iswap-like cphase cross-entropy benchmarking. presented approach can be extended...
Quantum computing can become scalable through error correction, but logical rates only decrease with system size when physical errors are sufficiently uncorrelated. During computation, unused high energy levels of the qubits excited, creating leakage states that long-lived and mobile. Particularly for superconducting transmon qubits, this opens a path to correlated in space time. Here, we report reset protocol returns qubit ground state from all relevant higher level states. We test its...
Strongly correlated quantum systems give rise to many exotic physical phenomena, including high-temperature superconductivity. Simulating these on computers may avoid the prohibitively high computational cost incurred in classical approaches. However, systematic errors and decoherence effects presented current devices make it difficult achieve this. Here, we simulate dynamics of one-dimensional Fermi-Hubbard model using 16 qubits a digital superconducting processor. We observe separations...
The interplay of interactions and strong disorder can lead to an exotic quantum many-body localized (MBL) phase matter. Beyond the absence transport, MBL has distinctive signatures, such as slow dephasing logarithmic entanglement growth; they commonly result in subtle modifications dynamics, rendering their measurement challenging. Here, we experimentally characterize these properties a system coupled superconducting qubits. By implementing sensitive techniques, map out structure local...
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...
An insightful study of the subthreshold characteristics deep-submicrometer fully depleted SOI MOSFET's, based on two-dimensional numerical (PISCES) device simulations, shows that gate swing and off-state current are governed by bias-dependent source/drain charge sharing, which controls back-channel as well front-channel conduction. The insight from this guides development a physical, analytic model for charge, is linked to our strong-inversion formalism in SOISPICE circuit simulation....
The SVX vertex detector has been very successful in heavy flavor physics at CDF, playing a significant role both top and bottom analyses. SVX′, radiation hard version of SVX, is presently taking data. In 1998 the Main Injector upgrade to accelerator complex Fermilab will provide increase luminosity, require new detector, II. specifications design considerations for this are discussed.
Precision tracking and vertex reconstruction play a crucial role in heavy flavor physics at CDF, reconstructing the charm beauty decay vertices top events. A significant upgrade to CDF detector, including new silicon tracker, will support an extensive program with high luminosity provided by Main Injector accelerator upgrade. The specifications design considerations for this tracker/vertex detector are discussed.
A physical model for the fully depleted submicrometer SOI MOSFET is described and used to assess performance of CMOS VLSI digital circuits. The computer-aided analysis focused on both problematic beneficial effects parasitic bipolar junction transistor (BJT) in floating-body device. study shows that problems overwhelm benefits, hence must be alleviated by controlling activation BJT via device design tradeoffs. feasible approach needed optimization demonstrated veritable device/circuit...
The key performance advantages and challenges of SOI CMOS for ULSI applications are discussed in detail. Included is an insightful analysis comparing the benefits technologies over its bulk-Si counterpart. hysteretic trends a floating-body PD/SOI inverter circuit uniquely characterized using Teradyne J971 system; charge-dump self-heating effects shown to be under control advanced 0.13 /spl mu/m device technology. Future technology opportunities described that could provide viable roadmap...
The NuTel collaboration is building a wide field-of-view Čerenkov telescope to be installed on mountain site for observing near horizontal air showers emerging from another mountain. Cosmic tau neutrinos the primary source of such showers. This technique will realized first time in ν τ energy range 2 PeV 1000 PeV. has enough sensitivity observe cosmic sources like Active Galactic Nuclei and Center assuming fluxes current theoretical models.
Fully depleted (FD) SOI CMOS is a contender for low-voltage IC applications. However, as FD/SOI MOSFETs are scaled, floating-body effects, which previously seemed insignificant, become important. In this paper, we report kinks in the measured subthreshold current-voltage characteristics of highly scaled MOSFETs, and describe model underlying physical mechanism, showing how it differs from familiar kink effect partially (PD) devices. The insight afforded qualifies meaning implies new design...