Broadband Lamb shift in an engineered quantum system

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-06
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en
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Nature Physics
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.
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| 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