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<p>The development of superconducting quantum computing platforms faces considerable scaling challenges because individual signal lines are required to control each qubit. This wiring overhead is a result of the low level of integration between the control electronics at room temperature and the qubits operating at millikelvin temperatures. A promising alternative is to use cryogenic superconducting digital control electronics that coexist with qubits. Here we present an active quantum processor unit in which qubits and single-flux quantum control electronics are integrated into a single multi-chip module via flip-chip bonding. Our system uses digital demultiplexing to distribute control pulses to several qubits, thus breaking the linear scaling of control lines to the number of qubits. With this approach, we demonstrate single-qubit fidelities above 99% and up to 99.9%.</p>

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A quantum computer controlled by superconducting digital electronics at millikelvin temperature

  • 期刊论文

  • 发表日期：

    2026年3月10日

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  • Caleb Jordan,
  • Jacob Bernhardt,
  • Joseph Rahamim,
  • Alex Kirichenko,
  • Karthik Bharadwaj,
  • Louis Fry-Bouriaux,
  • Aaron Somoroff,
  • Katie Porsch,
  • Kan-Ting Tsai,
  • Jason Walter,
  • Adam Weis,
  • Meng-Ju Yu,
  • Mario Renzullo,
  • Jerome Javelle,
  • Chris Checkley,
  • Oleg Mukhanov,
  • Daniel Yohannes,
  • Igor Vernik,
  • Shu-Jen Han

摘要

The development of superconducting quantum computing platforms faces considerable scaling challenges because individual signal lines are required to control each qubit. This wiring overhead is a result of the low level of integration between the control electronics at room temperature and the qubits operating at millikelvin temperatures. A promising alternative is to use cryogenic superconducting digital control electronics that coexist with qubits. Here we present an active quantum processor unit in which qubits and single-flux quantum control electronics are integrated into a single multi-chip module via flip-chip bonding. Our system uses digital demultiplexing to distribute control pulses to several qubits, thus breaking the linear scaling of control lines to the number of qubits. With this approach, we demonstrate single-qubit fidelities above 99% and up to 99.9%.