Broadband Lamb shift in an engineered quantum system

Matti Silveri*, Shumpei Masuda, Vasilii Sevriuk, Kuan Y. Tan, Máté Jenei, Eric Hyyppä, Fabian Hassler, Matti Partanen, Jan Goetz, Russell E. Lake, Leif Grönberg, Mikko Möttönen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)
197 Downloads (Pure)

Abstract

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 spectra 1–6 . 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 computing 7,8 . However, it is challenging to resolve the Lamb shift in its original broadband case in the absence of a tuneable environment. Consequently, previous observations 1–5 , 9 in non-atomic systems are limited to environments comprising narrowband modes 10–12 . Here, we observe a broadband Lamb shift in high-quality superconducting resonators, a scenario also accessing static shifts inaccessible in Lamb’s experiment 1,2 . 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 junctions 13–15 . Our results may lead to improved control of dissipation in high-quality engineered quantum systems and open new possibilities for studying synthetic open quantum matter 16–18 using this hybrid experimental platform.

Original languageEnglish
Number of pages8
JournalNature Physics
Volume15
Issue number6
DOIs
Publication statusPublished - Jun 2019
MoE publication typeA1 Journal article-refereed

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  • Datasets

    Data_for_arXiv_1809_00822

    Goetz, J. (Creator), Silveri, M. (Creator), Masuda, S. (Creator), Sevriuk, V. (Creator), Tan, K. (Creator), Jenei, M. (Creator), Hyyppä, E. (Creator), Hassler, F. (Creator), Partanen, M. (Creator), Lake, R. (Creator), Grönberg, L. (Creator), Möttönen, M. (Creator), 2018

    Dataset

    Projects

    QUESS - Quantum Environment Engineering for Steered Systems

    Möttönen, M., Partanen, M., Silveri, M., Ikonen, J., Oinonen, N., Tiurev, K., Girard, J., Mäkinen, A., Tuorila, J., Keränen, A., Väisänen, E., Gunyhó, A., Zhang, J., Kohvakka, K., Abuzaid, O., Lebedeff, S. & Kivijärvi, H.

    23/12/201628/02/2022

    Project: EU: ERC grants

    NEQC: Noise-Enhanced Quantum Control

    Goetz, J.

    01/04/201830/04/2020

    Project: EU: Framework programmes funding

    Equipment

    OtaNano

    Anna Rissanen (Manager)

    Aalto University

    Facility/equipment: Facility

  • Press / Media

    Quantum physicists succeed in controlling energy losses and shifts

    Matti Silveri

    11/03/201921/03/2019

    6 items of Media coverage

    Press/Media: Media appearance

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