University of Oulu

Hsu, H., Silveri, M., Gunyhó, A., Goetz, J., Catelani, G, Möttönen, M. (2020) Tunable refrigerator for nonlinear quantum electric circuits. Physical Review B, 101 (23), 235422.

Tunable refrigerator for nonlinear quantum electric circuits

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Author: Hsu, Hao1; Silveri, Matti2,3; Gunyhó, András2;
Organizations: 1JARA Institute for Quantum Information (PGI-11), Forschungszentrum Jülich, 52425 Jülich, Germany
2QCD Labs, QTF Centre of Excellence, Department of Applied Physics, Aalto University, P.O. Box 13500, FI-00076 Aalto, Finland
3Research Unit of Nano and Molecular Systems, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
4IQM, Keilaranta 19, FI-02150 Espoo, Finland
5VTT Technical Research Centre of Finland Ltd., P.O. Box 1000, FI-02044 VTT, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.5 MB)
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Language: English
Published: American Physical Society, 2020
Publish Date: 2020-07-01


The emerging quantum technological applications call for fast and accurate initialization of the corresponding devices to low-entropy quantum states. To this end, we theoretically study a recently demonstrated quantum-circuit refrigerator in the case of nonlinear quantum electric circuits such as superconducting qubits. The maximum refrigeration rate of transmon and flux qubits is observed to be roughly an order of magnitude higher than that of usual linear resonators, increasing flexibility in the design. We find that for typical experimental parameters, the refrigerator is suitable for resetting different qubit types to fidelities above 99.99% in a few or a few tens of nanoseconds depending on the scenario. Thus the refrigerator appears to be a promising tool for quantum technology and for detailed studies of open quantum systems.

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Series: Physical review. B
ISSN: 2469-9950
ISSN-E: 2469-9969
ISSN-L: 2469-9950
Volume: 101
Issue: 23
Article number: 235422
DOI: 10.1103/PhysRevB.101.235422
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: This research was financially supported by: European Research Council under Grant No. 681311 (QUESS) and Marie Skłodowska-Curie Grant No. 795159; Academy of Finland under its Centres of Excellence Program Grant No. 312300, and Grant Nos. 265675, 305237, 305306, 308161, 312300, 314302, 316551, 316619, 320086; Finnish Cultural Foundation; the Jane and Aatos Erkko Foundation; Vilho, Yrjö and Kalle Väisälä Foundation; the Emil Aaltonen Foundation; the Alfred Kordelin Foundation; the Technology Industries of Finland Centennial Foundation; and the Internationalization Fund - Cutting-Edge Ideas initiative of Forschungszentrum Jülich.
Academy of Finland Grant Number: 316619
Detailed Information: 316619 (Academy of Finland Funding decision)
320086 (Academy of Finland Funding decision)
Copyright information: © 2020 American Physical Society. Published in this repository with the kind permission of the publisher.