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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.

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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