University of Oulu

Silveri, M., Grabert, H., Masuda, S., Tan, K., Möttönen, M. (2017) Theory of quantum-circuit refrigeration by photon-assisted electron tunneling. Physical Review B, 96 (9), 094524. doi:10.1103/PhysRevB.96.094524

Theory of quantum-circuit refrigeration by photon-assisted electron tunneling

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Author: Silveri, Matti1,2; Grabert, Hermann3; Masuda, Shumpei1;
Organizations: 1QCD Labs, COMP Centre of Excellence, Department of Applied Physics, Aalto University, P.O. Box 13500, FI-00076 Aalto, Finland
2Research Unit of Nano and Molecular Systems, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
3Department of Physics, University of Freiburg, D-79104 Freiburg, Germany
4University of Jyväskylä, Department of Mathematical Information Technology, P.O. Box 35, FI-40014 University of Jyväskylä, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.6 MB)
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Language: English
Published: American Physical Society, 2017
Publish Date: 2017-11-15


We focus on a recently experimentally realized scenario of normal-metal–insulator–superconductor tunnel junctions coupled to a superconducting resonator. We develop a first-principles theory to describe the effect of photon-assisted electron tunneling on the quantum state of the resonator. Our results are in very good quantitative agreement with the previous experiments on refrigeration and heating of the resonator using the photon-assisted tunneling, thus providing a stringent verification of the developed theory. Importantly, our results provide simple analytical estimates of the voltage-tunable coupling strength and temperature of the thermal reservoir formed by the photon-assisted tunneling. Consequently, they are used to introduce optimization principles for initialization of quantum devices using such a quantum-circuit refrigerator. Thanks to the first-principles nature of our approach, extension of the theory to the full spectrum of quantum electric devices seems plausible.

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Series: Physical review. B
ISSN: 2469-9950
ISSN-E: 2469-9969
ISSN-L: 2469-9950
Volume: 96
Issue: 9
Article number: 094524
DOI: 10.1103/PhysRevB.96.094524
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); by Academy of Finland under Grants No. 251748, No. 265675, No. 276528, No. 284621, No. 305237, No. 305306, No. 308161, and No. 312300; and by Alfred Kordelin Foundation.
Copyright information: © 2017 American Physical Society. Published in this repository with the kind permission of the publisher.