Characterization of Parametric Entangling Gates on a Multi-Qubit Quantum Processor

ORAL

Abstract

Two-qubit gates activated via a parametrically driven, flux-tunable coupler are a promising approach to engineering fast, high-fidelity entanglement without the potential sacrifice in qubit coherence that comes with a fully tunable architecture. Flux-modulated couplers can also enable a universal hardware-native gateset — an invaluable resource for reducing circuit depth and improving algorithm performance on noisy intermediate scale quantum (NISQ) devices. However, realizing a coherence-limited gate fidelity remains a challenge. In this work, we experimentally investigate the sources of coherent error that limit the parametric gate fidelity in a multi-qubit device. Through identifying these error mechanisms, we explore a physically motivated, systematic approach to calibrating a continuous hardware-native gateset for efficient near-term algorithms.

*This work was funded by the Army Research Office under grant W911NF1810178.

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Presenters

  • Larry Chen

    • University of California, Berkeley
    • Physics, University of California, Berkeley
    • Univ of California – Berkeley

Authors

  • Larry Chen

    • University of California, Berkeley
    • Physics, University of California, Berkeley
    • Univ of California – Berkeley

  • Ravi K. Naik

    • University of California, Berkeley
    • Univ of California – Berkeley
    • Physics, University of California, Berkeley
    • University of California Berkeley
    • Univ of California - Berkeley
    • Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California, Berkeley
    • University of California - Berkeley

  • John Mark Kreikebaum

    • Lawrence Berkeley National Laboratory
    • University of California, Berkeley
    • Univ of California – Berkeley
    • Physics, University of California, Berkeley

  • David Ivan Santiago

    • Lawrence Berkeley National Laboratory
    • University of California, Berkeley
    • Lawrence Berkely National Laboratory
    • Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California, Berkeley

  • Irfan Siddiqi

    • Lawrence Berkeley National Laboratory
    • University of California, Berkeley
    • Univ of California - Berkeley
    • Univ of California – Berkeley
    • Quantum Nanoelectronics Lab, UC Berkeley
    • Physics, University of California, Berkeley
    • Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California, Berkeley