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High-fidelity parametric beamsplitting with a parity-protected converter

Author

Listed:
  • Yao Lu

    (Yale University
    Yale University)

  • Aniket Maiti

    (Yale University
    Yale University)

  • John W. O. Garmon

    (Yale University
    Yale University)

  • Suhas Ganjam

    (Yale University
    Yale University)

  • Yaxing Zhang

    (Yale University
    Yale University)

  • Jahan Claes

    (Yale University
    Yale University)

  • Luigi Frunzio

    (Yale University
    Yale University)

  • Steven M. Girvin

    (Yale University
    Yale University)

  • Robert J. Schoelkopf

    (Yale University
    Yale University)

Abstract

Fast, high-fidelity operations between microwave resonators are an important tool for bosonic quantum computation and simulation with superconducting circuits. An attractive approach for implementing these operations is to couple these resonators via a nonlinear converter and actuate parametric processes with RF drives. It can be challenging to make these processes simultaneously fast and high fidelity, since this requires introducing strong drives without activating parasitic processes or introducing additional decoherence channels. We show that in addition to a careful management of drive frequencies and the spectrum of environmental noise, leveraging the inbuilt symmetries of the converter Hamiltonian can suppress unwanted nonlinear interactions, preventing converter-induced decoherence. We demonstrate these principles using a differentially-driven DC-SQUID as our converter, coupled to two high-Q microwave cavities. Using this architecture, we engineer a highly-coherent beamsplitter and fast (~100 ns) swaps between the cavities, limited primarily by their intrinsic single-photon loss. We characterize this beamsplitter in the cavities’ joint single-photon subspace, and show that we can detect and post-select photon loss events to achieve a beamsplitter gate fidelity exceeding 99.98%, which to our knowledge far surpasses the current state of the art.

Suggested Citation

  • Yao Lu & Aniket Maiti & John W. O. Garmon & Suhas Ganjam & Yaxing Zhang & Jahan Claes & Luigi Frunzio & Steven M. Girvin & Robert J. Schoelkopf, 2023. "High-fidelity parametric beamsplitting with a parity-protected converter," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-41104-0
    DOI: 10.1038/s41467-023-41104-0
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    References listed on IDEAS

    as
    1. Yvonne Y. Gao & Brian J. Lester & Kevin S. Chou & Luigi Frunzio & Michel H. Devoret & Liang Jiang & S. M. Girvin & Robert J. Schoelkopf, 2019. "Entanglement of bosonic modes through an engineered exchange interaction," Nature, Nature, vol. 566(7745), pages 509-512, February.
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    3. Ruichao Ma & Brendan Saxberg & Clai Owens & Nelson Leung & Yao Lu & Jonathan Simon & David I. Schuster, 2019. "A dissipatively stabilized Mott insulator of photons," Nature, Nature, vol. 566(7742), pages 51-57, February.
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