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<p>Quantum annealing is a method to solve optimization problems that leverages quantum tunneling in a coupled qubit system. We present a detailed study of the coherence of a tunable capacitively-shunted flux qubit, designed for coherent quantum annealing applications. We find that for high qubit frequencies, thermal noise in the bias line makes a significant contribution to the relaxation, arising from the design choice to experimentally explore both fast annealing and high-frequency control. The measured dephasing rate is primarily due to intrinsic low-frequency flux noise in the two qubit loops, with additional contribution from the low-frequency noise of control electronics used for fast annealing. Our results characterize decoherence in a realistic setup for quantum annealing and are relevant for ongoing efforts toward building superconducting quantum annealers with increased coherence.</p>

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Decoherence of a tunable capacitively shunted flux qubit

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年11月19日

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  • Robbyn Trappen,
  • Xi Dai,
  • M. Ali Yurtalan,
  • Denis Melanson,
  • Daniel M. Tennant,
  • Antonio J. Martinez,
  • Yongchao Tang,
  • Joseph Gibson,
  • Jeffrey A. Grover,
  • Steven M. Disseler,
  • James I. Basham,
  • Rabindra Das,
  • David K. Kim,
  • Alexander J. Melville,
  • Bethany M. Niedzielski,
  • Cyrus F. Hirjibehedin,
  • Kyle Serniak,
  • Steven J. Weber,
  • Jonilyn L. Yoder,
  • William D. Oliver,
  • Daniel A. Lidar,
  • Adrian Lupascu

摘要

Quantum annealing is a method to solve optimization problems that leverages quantum tunneling in a coupled qubit system. We present a detailed study of the coherence of a tunable capacitively-shunted flux qubit, designed for coherent quantum annealing applications. We find that for high qubit frequencies, thermal noise in the bias line makes a significant contribution to the relaxation, arising from the design choice to experimentally explore both fast annealing and high-frequency control. The measured dephasing rate is primarily due to intrinsic low-frequency flux noise in the two qubit loops, with additional contribution from the low-frequency noise of control electronics used for fast annealing. Our results characterize decoherence in a realistic setup for quantum annealing and are relevant for ongoing efforts toward building superconducting quantum annealers with increased coherence.