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Phonon downconversion to suppress correlated errors in superconducting qubits

Author

Listed:
  • V. Iaia

    (Syracuse University)

  • J. Ku

    (Syracuse University)

  • A. Ballard

    (Syracuse University)

  • C. P. Larson

    (Syracuse University)

  • E. Yelton

    (Syracuse University)

  • C. H. Liu

    (University of Wisconsin-Madison)

  • S. Patel

    (University of Wisconsin-Madison)

  • R. McDermott

    (University of Wisconsin-Madison)

  • B. L. T. Plourde

    (Syracuse University)

Abstract

Quantum error correction can preserve quantum information in the presence of local errors, but correlated errors are fatal. For superconducting qubits, high-energy particle impacts from background radioactivity produce energetic phonons that travel throughout the substrate and create excitations above the superconducting ground state, known as quasiparticles, which can poison all qubits on the chip. We use normal metal reservoirs on the chip back side to downconvert phonons to low energies where they can no longer poison qubits. We introduce a pump-probe scheme involving controlled injection of pair-breaking phonons into the qubit chips. We examine quasiparticle poisoning on chips with and without back-side metallization and demonstrate a reduction in the flux of pair-breaking phonons by over a factor of 20. We use a Ramsey interferometer scheme to simultaneously monitor quasiparticle parity on three qubits for each chip and observe a two-order of magnitude reduction in correlated poisoning due to background radiation.

Suggested Citation

  • V. Iaia & J. Ku & A. Ballard & C. P. Larson & E. Yelton & C. H. Liu & S. Patel & R. McDermott & B. L. T. Plourde, 2022. "Phonon downconversion to suppress correlated errors in superconducting qubits," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33997-0
    DOI: 10.1038/s41467-022-33997-0
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    References listed on IDEAS

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