Understanding and mitigating decoherence in fluxonium qubits – Dephasing

ORAL

Abstract

The fluxonium qubit is a promising candidate for the physical realization of quantum computation on the superconducting circuits platform. State-of-the-art devices have achieved relaxation time (T1) and coherence time (T2) of several hundred microseconds, but the reported T2 in the literature for various parameter regimes and flux biases has not reached the limit of 2T1. We present theoretical models and experimental data to study dephasing mechanisms in fluxonium qubits. Statistics and temporal fluctuations in measured data are analyzed to reveal the impact of environmental noise on device performance at different time scales. We will discuss the choice of device parameters, the characterization and suppression of noise levels, and the strategies for mitigating dephasing mechanisms. The improvement of coherence time paves the way for high-fidelity gate operations in fluxonium-based quantum processors.

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Presenters

  • Gengyan Zhang

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory
    • Alibaba Group, Alibaba Quantum Laboratory

Authors

  • Gengyan Zhang

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory
    • Alibaba Group, Alibaba Quantum Laboratory

  • Hantao Sun

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory

  • Hao Deng

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory
    • Princeton University

  • Dawei Ding

    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory
    • Alibaba Group, Alibaba Quantum Laboratory

  • Ran Gao

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory

  • Xun Gao

    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Group, Alibaba Quantum Laboratory

  • Hsiang-Sheng Ku

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory
    • Alibaba Group, Alibaba Quantum Laboratory

  • Xun Jiang

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory

  • Zhisheng Li

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory

  • Xiaotong Ni

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Group, Alibaba Quantum Laboratory

  • Jin Qin

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory

  • Zhijun Song

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory

  • Chengchun Tang

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory

  • Tenghui Wang

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory
    • Alibaba Group, Alibaba Quantum Laboratory

  • Feng Wu

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory
    • Alibaba Group, Alibaba Quantum Laboratory

  • Wenlong Yu

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory

  • Tian Xia

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory

  • Xiaohang Zhang

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory

  • Jingwei Zhou

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory

  • Xing Zhu

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory

  • Additional Contributing AQL Members

    • Alibaba Quantum Laboratory, Alibaba Group

  • Yaoyun Shi

    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory
    • Alibaba Group, Alibaba Quantum Laboratory

  • Jianxin Chen

    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory
    • Alibaba Group, Alibaba Quantum Laboratory

  • Hui-Hai Zhao

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory
    • Alibaba Group, Alibaba Quantum Laboratory

  • Chunqing Deng

    • Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory, Alibaba Group
    • Alibaba Quantum Laboratory
    • Alibaba Group, Alibaba Quantum Laboratory