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The QuEL-1 SE multichannel qubit controller uses active thermal stabilization to achieve high amplitude and phase stability for superconducting qubits. This stability enables reliable, long-duration quantum operations, crucial for fault-tolerant quantum computing.

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Area of Science:

  • Quantum Computing
  • Quantum Control Systems
  • Superconducting Qubits

Background:

  • Superconducting qubits require precise control for quantum operations.
  • Long-term amplitude and phase drift in control systems can degrade quantum gate fidelity.
  • Scalable control platforms are essential for advancing quantum computing.

Purpose of the Study:

  • To present the design and performance of the QuEL-1 SE multichannel qubit controller.
  • To demonstrate the system's ability to suppress long-term amplitude and phase drift.
  • To evaluate the impact of stability on quantum gate fidelity for superconducting qubits.

Main Methods:

  • Active thermal stabilization of critical analog integrated circuits (PLLs, amplifiers, mixers).
  • Simultaneous monitoring of 15 microwave output channels over 24 hours using a common ADC.
  • Estimation of quantum gate fidelity under coherent errors corresponding to observed amplitude and phase deviations.

Main Results:

  • Normalized amplitude exhibited standard deviations of 0.09%-0.22% (mean: 0.15%).
  • Phase deviations were 0.35°-0.44° (mean: 0.39°).
  • Estimated infidelity contribution to Xπ/2 gate due to amplitude noise (2 × 10-6) and phase misalignment (2 × 10-5) is below fault-tolerance thresholds.

Conclusions:

  • The QuEL-1 SE demonstrates excellent amplitude and phase stability.
  • This stability enables reliable long-duration quantum operations.
  • QuEL-1 SE is a promising scalable control platform for superconducting and other qubit modalities.