In-situ tunable environment for superconducting qubits

ORAL

Abstract

Superconducting quantum circuits hold great potential in providing revolutionizing practical applications such as quantum sensing or computing. However, in many cases noise limits the operation and the fidelity of these circuits. Here we introduce a concept that exploits noise instead of trying to reduce it. Our concept uses photon-assisted single-electron tunneling as a controlled source for dissipation in superconducting qubits. We show how the recently developed quantum-circuit refrigerator [1], QCR, is suitable to control the dynamics of superconducting qubits. In our experiments, the QCR works as a voltage-controlled environmental bath for the qubit. The qubit-bath coupling strength can be tuned over several orders of magnitude on a nanosecond timescale. Such a tunable environment is promising for fast qubit reset and studies of dissipative open quantum circuits. Our highly integrable circuit architecture may prove useful in the initialization of qubit arrays and in dissipation-assisted quantum annealing.

[1] K. Y. Tan, et al., Nature Commun. 8, 15189 (2017)

*We acknowledge financial support by European Research Council under Grant No. 681311 (QUESS); by Academy of Finland under Grants No. No. 265675, No. 276528, No. 284621, No. 305237, No. 305306, No. 308161, and No. 312300.

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Presenters

  • Jan Goetz

    • Walther-Meißner-Institut & TU München
    • QCD Labs, Aalto University
    • QCD Labs, Department of Applied Physics, Aalto University

Authors

  • Jan Goetz

    • Walther-Meißner-Institut & TU München
    • QCD Labs, Aalto University
    • QCD Labs, Department of Applied Physics, Aalto University

  • Matti Silveri

    • Research Unit of Nano and Molecular Systems, University of Oulu
    • QCD Labs, Department of Applied Physics, Aalto University

  • Kuan Tan

    • QCD Labs, Aalto University

  • Matti Partanen

    • QCD Labs, Department of Applied Physics, Aalto University
    • QCD Labs, Aalto University

  • Marton Gunyho

    • QCD Labs, Aalto University
    • QCD Labs, Department of Applied Physics, Aalto University

  • Dibyendu Hazra

    • PHELIQS, CEA Grenoble
    • QCD Labs, Aalto University
    • QCD Labs, Department of Applied Physics, Aalto University

  • Visa Vesterinen

    • VTT Technical Research Centre of Finland Ltd

  • Juha Hassel

    • VTT Technical Research Centre of Finland Ltd

  • Leif Grönberg

    • VTT Technical Research Centre of Finland Ltd

  • Hermann Grabert

    • Department of Physics, University of Freiburg

  • Mikko Möttönen

    • QCD Labs, Department of Applied Physics, Aalto University
    • QCD Labs, Aalto University
    • Department of applied physics, Aalto University