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  • Open Access

Active interference suppression in frequency-division-multiplexed quantum gates via off-resonant microwave tones

Haruki Mitarai*, Yukihiro Tadokoro†, and Hiroya Tanaka‡

  • *Contact author: hmitarai@mosk.tytlabs.co.jp
  • †Contact author: y.tadokoro@ieee.org
  • ‡Contact author: tanak@mosk.tytlabs.co.jp
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Phys. Rev. Research 8, 033376 – Published 29 September, 2026

DOI: https://doi.org/10.1103/gcf3-f89t

Abstract

The increasing number of control lines connecting quantum processors to external electronics constitutes a major bottleneck in the realization of large-scale quantum computers. Frequency-division multiplexing is expected to enable control of multiple qubits through a single microwave cable; however, interference from off-resonant microwave tones hinders precise qubit control. Here, we propose an active interference suppression method for frequency-division-multiplexed simultaneous gates on microwave-controlled qubits. We demonstrate that the deliberate incorporation of off-resonant microwave tones improves single-qubit gate fidelity. In particular, the gate infidelity scales inversely with the square of the number of microwave tones when off-resonant orthogonal or quasi-orthogonal tones are incorporated. Furthermore, we show that fast oscillations, neglected under the rotating wave approximation, degrade the gate fidelity, and that this degradation can be mitigated through optimized frequency allocation. The proposed approach is simple and effective for improving the performance of frequency-division-multiplexed quantum gates.

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Phys. Rev. Research 8, 033376– Published 29 September, 2026
  • Received 11 March 2026
  • Accepted 5 September 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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