Photon-number-dependent effective Lamb shift

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-09
Major/Subject
Mcode
Degree programme
Language
en
Pages
14
Series
PHYSICAL REVIEW RESEARCH, Volume 3, issue 3
Abstract
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.
Description
| openaire: EC/H2020/681311/EU//QUESS | openaire: EC/H2020/795159/EU//NEQC
Keywords
QUANTUM SUPREMACY, VACUUM, CIRCUIT
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Citation
Viitanen , A , Silveri , M , Jenei , M , Sevriuk , V , Tan , K Y , Partanen , M , Goetz , J , Gronberg , L , Vadimov , V , Lahtinen , V & Mottonen , M 2021 , ' Photon-number-dependent effective Lamb shift ' , PHYSICAL REVIEW RESEARCH , vol. 3 , no. 3 , 033126 . https://doi.org/10.1103/PhysRevResearch.3.033126