Initial experimental results on a superconducting-qubit reset based on photon-assisted quasiparticle tunneling

Author:

Sevriuk V. A.1ORCID,Liu W.1ORCID,Rönkkö J.1,Hsu H.2,Marxer F.1,Mörstedt T. F.3ORCID,Partanen M.1,Räbinä J.1,Venkatesh M.1ORCID,Hotari J.1,Grönberg L.4ORCID,Heinsoo J.1,Li T.1ORCID,Tuorila J.1,Chan K. W.1,Hassel J.1ORCID,Tan K. Y.1ORCID,Möttönen M.134ORCID

Affiliation:

1. IQM Quantum Computers, Keilaranta 19, FI-02150 Espoo, Finland

2. IQM Quantum Computers, Nymphenburgerstr. 86, 80636 Munich, Germany

3. QCD Labs, QTF Centre of Excellence and Institute, Department of Applied Physics, Aalto University, PO Box 13500, FI-00076 Aalto, Finland

4. VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, FI-02044, VTT, Finland

Abstract

We present here our recent results on qubit reset scheme based on a quantum-circuit refrigerator (QCR). In particular, we use the photon-assisted quasiparticle tunneling through a superconductor–insulator–normal-metal–insulator–superconductor junction to controllably decrease the energy relaxation time of the qubit during the QCR operation. In our experiment, we use a transmon qubit with dispersive readout. The QCR is capacitively coupled to the qubit through its normal-metal island. We employ rapid, square-shaped QCR control voltage pulses with durations in the range of 2–350 ns and a variety of amplitudes to optimize the reset time and fidelity. Consequently, we reach a qubit ground-state probability of roughly 97% with 80-ns pulses starting from the first excited state. The qubit state probability is extracted from averaged readout signal, where the calibration is based on Rabi oscillations, thus not distinguishing the residual thermal population of the qubit.

Funder

European Research Council

H2020 European Research Council

Academy of Finland

Business Finland

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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