Baseband Control of Superconducting Qubits with Shared Microwave Drives

Peng Zhao, Ruixia Wang, Meng-Jun Hu, Teng Ma, Peng Xu, Yirong Jin, and Haifeng Yu
Phys. Rev. Applied 19, 054050 – Published 15 May 2023

Abstract

Accurate control of qubits is the central requirement for building functional quantum processors. For the current superconducting quantum processor, high-fidelity control of qubits is mainly based on independently calibrated microwave pulses, which could differ from each other in frequencies, amplitudes, and phases. With this control strategy, the needed physical resource could be challenging, especially when scaling up to large-scale quantum processors is considered. Inspired by Kane’s proposal for spin-based quantum computing, here, we explore theoretically the possibility of baseband flux control of superconducting qubits with only shared and always-on microwave drives. In our strategy, qubits are by default far detuned from the drive during system idle periods, qubit readout and baseband flux-controlled two-qubit gates can thus be realized with minimal impacts from the always-on drive. By contrast, during working periods, qubits are tuned on resonance with the drive and single-qubit gates can be realized. Therefore, universal qubit control can be achieved with only baseband flux pulses and always-on shared microwave drives. We apply this strategy to the qubit architecture where tunable qubits are coupled via a tunable coupler, and the analysis shows that high-fidelity qubit control is possible. Besides, the baseband control strategy needs fewer physical resources, such as control electronics and cooling power in cryogenic systems, than that of microwave control. Of note, the flexibility of baseband flux control could be employed for addressing the nonuniformity issue of superconducting qubits, potentially allowing the realization of multiplexing and cross-bar technologies and thus controlling large numbers of qubits with fewer control lines. We thus expect that baseband control with shared microwave drives can help build large-scale superconducting quantum processors.

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  • Received 20 November 2022
  • Revised 23 January 2023
  • Accepted 25 April 2023

DOI:https://doi.org/10.1103/PhysRevApplied.19.054050

© 2023 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Peng Zhao1,*, Ruixia Wang1,†, Meng-Jun Hu1, Teng Ma1, Peng Xu2, Yirong Jin1, and Haifeng Yu1,‡

  • 1Beijing Academy of Quantum Information Sciences, Beijing 100193, China
  • 2Institute of Quantum Information and Technology, Nanjing University of Posts and Telecommunications, Nanjing, Jiangsu 210003, China

  • *shangniguo@sina.com
  • wangrx@baqis.ac.cn
  • hfyu@baqis.ac.cn

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Vol. 19, Iss. 5 — May 2023

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