APS Logo

Path-Independent Gates for Error-Corrected Quantum Computing: Experiment

ORAL

Abstract

In future fault-tolerant quantum computers, errors resulting from noise and decoherence must be detected and corrected in real-time. This is particularly important while applying logical gates, which can cause errors to quickly spread throughout the system.
Here, we present an error-corrected construction for a logical gate set [1] enacted by a multilevel transmon ancilla on a cavity-encoded logical qubit. We show that the logical information is maintained by detecting ancilla errors and applying the appropriate corrections to the logical qubit. The error-corrected operation is path-independent of dominant ancilla errors, leading to a sixfold suppression of the gate error with increased energy relaxation, and a fourfold suppression with increased dephasing noise. The results support the viability of hardware-efficient bosonic quantum computation by showing that bosonic qubits can be controlled by error-prone ancillas without inheriting their inferior performance.

[1] P. Reinhold et al., arXiv:1907.12327 (2019).

–

Presenters

  • Serge Rosenblum

    Departments of Applied Physics and Physics, Yale University

Authors

  • Serge Rosenblum

    Departments of Applied Physics and Physics, Yale University

  • Philip Reinhold

    Departments of Applied Physics and Physics, Yale University

  • Wen-Long Ma

    Pritzker School of Molecular Engineering, University of Chicago

  • Luigi Frunzio

    Yale University, Department of Applied Physics, Yale University, Departments of Applied Physics and Physics, Yale University

  • Liang Jiang

    University of Chicago, Pritzker School for Molecular Engineering, University of Chicago, Pritzker School of Molecular Engineering, University of Chicago, Yale University

  • Robert Schoelkopf

    Yale University, Department of Applied Physics, Yale University, Departments of Applied Physics and Physics, Yale University