Unconditional reset of a qubit readout resonator using multichannel driving

ORAL

Abstract

Rapid measurement is important for many quantum computing applications, such as quantum error-correction codes. We demonstrate a method for reducing the waiting time between successive measurements in a circuit QED system by actively depleting photons from a readout resonator after a measurement. The resonator ring-down time is reduced without feedback, independent of the measurement outcome. We achieve this by applying a readout tone near the resonator resonance frequency simultaneously to both the resonator and the qubit, which realizes an effectively longitudinal interaction between them [1, 2]. We present results from numerical simulations and from experiments on a typical circuit QED system.

[1] J. Ikonen, et al, Phys. Rev. Lett. 122, 080503 (2019)
[2] S. Touzard, et al, Phys. Rev. Lett. 122, 080502 (2019)

*The authors acknowledge support from the European Research Council under grant no. 681311 (QUESS), the Academy of Finland under its Centres of Excellence Program project no. 312300, the Jane and Aatos Erkko Foundation, and the Technology Industries of Finland Centennial Foundation.

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Presenters

  • András Gunyhó

    • QCD Labs, Department of Applied Physics, Aalto University

Authors

  • András Gunyhó

    • QCD Labs, Department of Applied Physics, Aalto University

  • Suman Kundu

    • QCD Labs, Department of Applied Physics, Aalto University

  • Joni Ikonen

    • IQM Quantum Computers
    • QCD Labs, Department of Applied Physics, Aalto University
    • IQM
    • IQM Finland Oy

  • Tianyi Li

    • IQM Quantum Computers
    • IQM Finland Oy

  • Mikko Möttönen

    • QCD Labs, Aalto University
    • QCD Labs, Department of Applied Physics, Aalto University
    • IQM Finland Oy