University of Oulu

Viitanen, A., Silveri, M., Jenei, M., Sevriuk, V., Tan, K. Y., Partanen, M., Goetz, J., Grönberg, L., Vadimov, V., Lahtinen, V., & Möttönen, M. (2021). Photon-number-dependent effective Lamb shift. Physical Review Research, 3(3).

Photon-number-dependent effective Lamb shift

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Author: Viitanen, Arto1; Silveri, Matti2; Jenei, Máté1,3;
Organizations: 1QCD Labs, QTF Center 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
3IQM Finland Oy, Keilaranta 19, FI-02150 Espoo, Finland
4VTT Technical Research Centre of Finland Ltd., QTF Center of Excellence, P.O. Box 1000, FI-02044 VTT, Finland
5MSP Group, QTF Centre of Excellence, Department of Applied Physics, Aalto University, P.O. Box 11000, FI-00076 Aalto, Finland
6Institute for Physics of Microstructures, Russian Academy of Sciences, 603950 Nizhny Novgorod, GSP-105, Russia
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.2 MB)
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Language: English
Published: American Physical Society, 2021
Publish Date: 2021-08-18


The Lamb shift, an energy shift arising from the presence of the electromagnetic vacuum, has been observed in various quantum systems and established as part of the energy shift independent of the environmental photon number. However, typical studies are based on simplistic bosonic models which may be challenged in practical quantum devices. We demonstrate a hybrid bosonic-fermionic environment for a linear resonator mode and observe that the photon number in the environment can dramatically increase both the dissipation and the effective Lamb shift of the mode. Our observations are quantitatively described by a first-principles model, which we develop here also to guide device design for future quantum-technological applications. The device demonstrated here can be utilized as a fully rf-operated quantum-circuit refrigerator to quickly reset superconducting qubits.

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Series: Physical review research
ISSN: 2643-1564
ISSN-E: 2643-1564
ISSN-L: 2643-1564
Volume: 3
Issue: 3
Article number: 033126
DOI: 10.1103/PhysRevResearch.3.033126
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: This research was financially supported by the European Research Council under Grant No. 681311 (QUESS) and Marie Skłodowska-Curie Grant No. 795159; by the Academy of Finland under its Centres of Excellence Program Grants No. 312300, No. 336810 No. 312059 No. 265675, No. 305237, No. 305306, No. 308161, No. 314302, No. 316551, No. 316619, and No. 318937; and by the Alfred Kordelin Foundation, the Emil Aaltonen Foundation, the Vilho, Yrjö, and Kalle Väisälä Foundation, the Jane and Aatos Erkko Foundation, and the Technology Industries of Finland Centennial Foundation.
Academy of Finland Grant Number: 316619
Detailed Information: 316619 (Academy of Finland Funding decision)
Copyright information: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.