University of Oulu

Silveri, M., Masuda, S., Sevriuk, V., Tan, K., Jenei, M., Hyyppä, E., Hassler, F., Partanen, M., Goetz, J., Lake, R., Grönberg, L., Möttönen, M. (2019) Broadband Lamb shift in an engineered quantum system. Nature Physics,

Broadband Lamb shift in an engineered quantum system

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Author: Silveri, Matti1,2; Masuda, Shumpei1,3; Sevriuk, Vasilii1;
Organizations: 1QCD Labs, QTF Center of Excellence, Department of Applied Physics, Aalto University, Aalto, Finland
2Research Unit of Nano and Molecular Systems, University of Oulu, Oulu, Finland
3College of Liberal Arts and Sciences, Tokyo Medical and Dental University, Ichikawa, Japan
4JARA Institute for Quantum Information, RWTH Aachen University, Aachen, Germany
5National Institute of Standards and Technology, Boulder, CO, USA
6VTT Technical Research Centre of Finland, QTF Center of Excellence, Espoo, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: Springer Nature, 2019
Publish Date: 2019-09-11


The shift of the energy levels of a quantum system owing to broadband electromagnetic vacuum fluctuations—the Lamb shift—has been central for the development of quantum electrodynamics and for the understanding of atomic spectra1,2,3,4,5,6. Identifying the origin of small energy shifts is still important for engineered quantum systems, in light of the extreme precision required for applications such as quantum computing7,8. However, it is challenging to resolve the Lamb shift in its original broadband case in the absence of a tuneable environment. Consequently, previous observations1,2,3,4,5,9 in non-atomic systems are limited to environments comprising narrowband modes10,11,12. Here, we observe a broadband Lamb shift in high-quality superconducting resonators, a scenario also accessing static shifts inaccessible in Lamb’s experiment1,2. We measure a continuous change of several megahertz in the fundamental resonator frequency by externally tuning the coupling strength to the engineered broadband environment, which is based on hybrid normal-metal–insulator–superconductor tunnel junctions13,14,15. Our results may lead to improved control of dissipation in high-quality engineered quantum systems and open new possibilities for studying synthetic open quantum matter16,17,18 using this hybrid experimental platform.

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Series: Nature physics
ISSN: 1745-2473
ISSN-E: 1745-2481
ISSN-L: 1745-2473
Volume: Early online
DOI: 10.1038/s41567-019-0449-0
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 grant nos. 312300 and 312059 and grant nos. 265675, 305237, 305306, 308161, 312300, 314302, 316551 and 316619; JST ERATO grant no. JPMJER1601, JSPS KAKENHI grant no. 18K03486 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: © The Author(s), under exclusive licence to Springer Nature Limited 2019. This is a post-peer-review, pre-copyedit version of an article published in Nature Physics. The final authenticated version is available online at: