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<p>Superconducting quantum processors have made important progress in size and computing potential. However, the practical cryogenic limitations of operating large numbers of superconducting qubits are becoming a bottleneck for further scaling. Due to the low thermal conductivity and the dense optical multiplexing capacity of telecommunications fibre, converting qubit signal processing to the optical domain using microwave-to-optics transduction would substantially relax the strain on cryogenic space and thermal budgets. Here we demonstrate optical readout of a superconducting transmon qubit through an optical fibre connected via a coaxial cable to a fully integrated piezo-optomechanical transducer. Using a demolition readout technique, we achieve a single-shot readout fidelity of 81%. Our results illustrate the benefits of piezo-optomechanical transduction for low-dissipation operation of large quantum processors.</p>

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Optical readout of a superconducting qubit using a piezo-optomechanical transducer

  • 期刊论文

  • 发表日期：

    2025年2月11日

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  • T. C. van Thiel,
  • M. J. Weaver,
  • F. Berto,
  • P. Duivestein,
  • M. Lemang,
  • K. L. Schuurman,
  • M. Žemlička,
  • F. Hijazi,
  • A. C. Bernasconi,
  • C. Ferrer,
  • E. Cataldo,
  • E. Lachman,
  • M. Field,
  • Y. Mohan,
  • F. K. de Vries,
  • C. C. Bultink,
  • J. C. van Oven,
  • J. Y. Mutus,
  • R. Stockill,
  • S. Gröblacher

摘要

Superconducting quantum processors have made important progress in size and computing potential. However, the practical cryogenic limitations of operating large numbers of superconducting qubits are becoming a bottleneck for further scaling. Due to the low thermal conductivity and the dense optical multiplexing capacity of telecommunications fibre, converting qubit signal processing to the optical domain using microwave-to-optics transduction would substantially relax the strain on cryogenic space and thermal budgets. Here we demonstrate optical readout of a superconducting transmon qubit through an optical fibre connected via a coaxial cable to a fully integrated piezo-optomechanical transducer. Using a demolition readout technique, we achieve a single-shot readout fidelity of 81%. Our results illustrate the benefits of piezo-optomechanical transduction for low-dissipation operation of large quantum processors.