Broadband Lamb shift in an engineered quantum system
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2019-06
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en
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8
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Nature Physics, Volume 15, issue 6
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.Description
| openaire: EC/H2020/681311/EU//QUESS | openaire: EC/H2020/795159/EU//NEQC
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Silveri, M, Masuda, S, Sevriuk, V, Tan, K Y, Jenei, M, Hyyppä, E, Hassler, F, Partanen, M, Goetz, J, Lake, R E, Grönberg, L & Möttönen, M 2019, ' Broadband Lamb shift in an engineered quantum system ', Nature Physics, vol. 15, no. 6 . https://doi.org/10.1038/s41567-019-0449-0