Juan Atalaya
A5078672240- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Mechanical and Optical Resonators
- Quantum and electron transport phenomena
- Quantum Mechanics and Applications
- Quantum many-body systems
- Advancements in Semiconductor Devices and Circuit Design
- Neural Networks and Reservoir Computing
- Advanced MEMS and NEMS Technologies
- Force Microscopy Techniques and Applications
- Carbon Nanotubes in Composites
- Semiconductor materials and devices
- Quantum-Dot Cellular Automata
- Advanced Thermodynamics and Statistical Mechanics
- Quantum optics and atomic interactions
- Neural Networks and Applications
- Physics of Superconductivity and Magnetism
- Photonic and Optical Devices
- Non-Destructive Testing Techniques
- Topological Materials and Phenomena
- Theoretical and Computational Physics
- Advanced Data Storage Technologies
- Magnetic and Electromagnetic Effects
- Spectroscopy and Quantum Chemical Studies
- Graphene research and applications
Google (United States)
2021-2025
University of California, Riverside
2017-2022
University of California, Berkeley
2020-2022
Berkeley College
2022
Coherent (United States)
2022
Michigan State University
2014-2016
Karlsruhe Institute of Technology
2014
Chalmers University of Technology
2005-2012
University of Gothenburg
2007
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...
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
Abstract Understanding how interacting particles approach thermal equilibrium is a major challenge of quantum simulators 1,2 . Unlocking the full potential such systems towards this goal requires flexible initial state preparation, precise time evolution and extensive probes for final characterization. Here we present simulator comprising 69 superconducting qubits that supports both universal gates high-fidelity analogue evolution, with performance beyond reach classical simulation in...
Starting from an atomistic approach, we have derived a hierarchy of successively more simplified continuum elasticity descriptions for modeling the mechanical properties suspended graphene sheets. We find that already deflections order 0.5 A theory correctly accounts nonlinearities is necessary and many purposes set coupled Duffing-type equations may be used to accurately describe dynamics membranes. The are validated by applying them square graphene-based resonators with clamped edges...
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...
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...
The rotating-wave approximation (RWA) is ubiquitous in the analysis of driven and coupled resonators. However, limitations RWA seem to be poorly understood some cases disposes essential physics. We investigate context electrical circuits. Using a classical Hamiltonian approach, we find that by balancing magnetic components resonator drive or resonator-resonator coupling, can made exact. This type balance, which exact, has applications superconducting qubits, where it suppresses nutation...
Quantum error correction (QEC) provides a practical path to fault-tolerant quantum computing through scaling large qubit numbers, assuming that physical errors are sufficiently uncorrelated in time and space. In superconducting arrays, high-energy impact events can produce correlated errors, violating this key assumption. Following such an event, phonons with energy above the gap propagate throughout device substrate, which turn generate temporary surge quasiparticle (QP) density array. When...
Abstract Building a large-scale quantum computer requires effective strategies to correct errors that inevitably arise in physical systems 1 . Quantum error-correction codes 2 present way reach this goal by encoding logical information redundantly into many qubits. A key challenge implementing such is accurately decoding noisy syndrome extracted from redundancy checks obtain the encoded information. Here we develop recurrent, transformer-based neural network learns decode surface code,...
Practical quantum computing will require error rates that are well below what is achievable with physical qubits. Quantum correction offers a path to algorithmically-relevant by encoding logical qubits within many qubits, where increasing the number of enhances protection against errors. However, introducing more also increases sources, so density errors must be sufficiently low in order for performance improve code size. Here, we report measurement qubit scaling across multiple sizes, and...
Off-resonant interaction of fluctuating photons in a resonator with qubit increases the dephasing rate. We use this effect to measure small average number intracavity that are coherently or thermally driven. For spectral resolution, we do by subjecting Carr-Purcell-Meiboom-Gill sequence and record rate for various periods between $\ensuremath{\pi}$ pulses. The recorded data is then analyzed formulas photon-induced derived non-Gaussian noise regime an arbitrary ratio dispersive shift decay...