Sabrina Hong
A5044081449- Quantum Computing Algorithms and Architecture
- Quantum Information and Cryptography
- Quantum and electron transport phenomena
- Quantum many-body systems
- Advancements in Semiconductor Devices and Circuit Design
- Neural Networks and Reservoir Computing
- Physics of Superconductivity and Magnetism
- Semiconductor materials and devices
- Quantum Mechanics and Applications
- Quantum-Dot Cellular Automata
- Neural Networks and Applications
- Quantum optics and atomic interactions
- Advanced Electrical Measurement Techniques
- Topological Materials and Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Theoretical and Computational Physics
- Advanced Data Storage Technologies
- Ultrasonics and Acoustic Wave Propagation
- Non-Destructive Testing Techniques
- Blood donation and transfusion practices
- Algebraic structures and combinatorial models
- Quantum, superfluid, helium dynamics
- Complex Network Analysis Techniques
- Blood groups and transfusion
- Sparse and Compressive Sensing Techniques
Google (United States)
2021-2025
University of California, Riverside
2022
Rigetti Computing (United States)
2018-2020
Harvard University
2009
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...
Abstract Practical quantum computing will require error rates well below those achievable with physical qubits. Quantum correction 1,2 offers a path to algorithmically relevant by encoding logical qubits within many qubits, for which increasing the number of enhances protection against errors. However, introducing more also increases sources, so density errors must be sufficiently low performance improve code size. Here we report measurement qubit scaling across several sizes, and...
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...
Harnessing techniques from analog signal processing, we establish a new path for large-scale quantum computation.
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...
Indistinguishability of particles is a fundamental principle quantum mechanics
Understanding universal aspects of quantum dynamics is an unresolved problem in statistical mechanics. In particular, the spin one-dimensional Heisenberg model were conjectured as to belong Kardar-Parisi-Zhang (KPZ) universality class based on scaling infinite-temperature spin-spin correlation function. a chain 46 superconducting qubits, we studied probability distribution magnetization transferred across chain's center, [Formula: see text]. The first two moments text] show superdiffusive...
Engineered dissipative reservoirs have the potential to steer many-body quantum systems toward correlated steady states useful for simulation of high-temperature superconductivity or magnetism. Using up 49 superconducting qubits, we prepared low-energy transverse-field Ising model through coupling auxiliary qubits. In one dimension, observed long-range correlations and a ground-state fidelity 0.86 18 qubits at critical point. two dimensions, found mutual information that extends beyond...
Undesired coupling to the surrounding environment destroys long-range correlations in quantum processors and hinders coherent evolution nominally available computational space. This noise is an outstanding challenge when leveraging computation power of near-term
A central challenge in building a scalable quantum computer with superconducting qubits is the execution of high-fidelity two-qubit gates presence many resonant elements. As more elements are added to architecture, and as multiplicity their couplings grows, design's frequency space becomes crowded, performance suffers. The authors present way address this difficulty: selective activation interactions between transmon fixed those tunable frequency. This depends on both amplitude modulation,...
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...
In state-of-the-art quantum computing platforms, including superconducting qubits and trapped ions, imperfections in the two-qubit entangling gates are dominant contributions of error to systemwide performance. Recently, a novel parametric gate was proposed demonstrated with transmon qubits. This is activated through rf modulation frequency can be operated at an amplitude where performance first-order insensitive flux noise. this work we experimentally validate existence ac sweet spot...
Inherent symmetry of a quantum system may protect its otherwise fragile states. Leveraging such protection requires testing robustness against uncontrolled environmental interactions. Using 47 superconducting qubits, we implement the one-dimensional kicked Ising model which exhibits non-local Majorana edge modes (MEMs) with $\mathbb{Z}_2$ parity symmetry. Remarkably, find that any multi-qubit Pauli operator overlapping MEMs uniform late-time decay rate comparable to single-qubit relaxation...
Systems of correlated particles appear in many fields modern science and represent some the most intractable computational problems nature. The challenge these systems arises when interactions become comparable to other energy scales, which makes state each particle depend on all particles1. lack general solutions for three-body problem acceptable theory strongly electrons shows that our understanding fades number or interaction strength increases. One hallmarks interacting is formation...
Abstract An important measure of the development quantum computing platforms has been simulation increasingly complex physical systems. Before fault-tolerant computing, robust error-mitigation strategies were necessary to continue this growth. Here, we validate recently introduced that exploit expectation ideal output a algorithm would be pure state. We consider task simulating electron systems in seniority-zero subspace where all electrons are paired with their opposite spin. This affords...