Abstract
broadband electromagnetic vacuum fluctuations—the Lamb
shift—has been central for the development of quantum electrodynamics
and for the understanding of atomic spectra1–6.
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 observations1–5,9 in non-atomic
systems are limited to environments comprising narrowband
modes10–12. Here, we observe a broadband Lamb shift in highquality
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
junctions13–15. Our results may lead to improved control of
dissipation in high-quality engineered quantum systems and
open new possibilities for studying synthetic open quantum
matter16–18 using this hybrid experimental platform.
| Original language | English |
|---|---|
| Number of pages | 8 |
| Journal | Nature Physics |
| DOIs | |
| Publication status | Published - 11 Mar 2019 |
| MoE publication type | Not Eligible |
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Broadband Lamb shift in an engineered quantum system. / Silveri, Matti (Corresponding Author); Masuda, Shumpei; Sevriuk, Vasilii; Tan, Kuan Y.; Jenei, Máté; Hyyppä, Eric; Hassler, Fabian; Partanen, Matti; Goetz, Jan; Lake, Russell E.; Grönberg, Leif; Möttönen, Mikko (Corresponding Author).
In: Nature Physics, 11.03.2019.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - Broadband Lamb shift in an engineered quantum system
AU - Silveri, Matti
AU - Masuda, Shumpei
AU - Sevriuk, Vasilii
AU - Tan, Kuan Y.
AU - Jenei, Máté
AU - Hyyppä, Eric
AU - Hassler, Fabian
AU - Partanen, Matti
AU - Goetz, Jan
AU - Lake, Russell E.
AU - Grönberg, Leif
AU - Möttönen, Mikko
PY - 2019/3/11
Y1 - 2019/3/11
N2 - The shift of the energy levels of a quantum system owing tobroadband electromagnetic vacuum fluctuations—the Lambshift—has been central for the development of quantum electrodynamicsand for the understanding of atomic spectra1–6.Identifying the origin of small energy shifts is still importantfor engineered quantum systems, in light of the extreme precisionrequired for applications such as quantum computing7,8.However, it is challenging to resolve the Lamb shift in itsoriginal broadband case in the absence of a tuneable environment.Consequently, previous observations1–5,9 in non-atomicsystems are limited to environments comprising narrowbandmodes10–12. Here, we observe a broadband Lamb shift in highqualitysuperconducting resonators, a scenario also accessingstatic shifts inaccessible in Lamb’s experiment1,2. We measurea continuous change of several megahertz in the fundamentalresonator frequency by externally tuning the couplingstrength to the engineered broadband environment, which isbased on hybrid normal-metal–insulator–superconductor tunneljunctions13–15. Our results may lead to improved control ofdissipation in high-quality engineered quantum systems andopen new possibilities for studying synthetic open quantummatter16–18 using this hybrid experimental platform.
AB - The shift of the energy levels of a quantum system owing tobroadband electromagnetic vacuum fluctuations—the Lambshift—has been central for the development of quantum electrodynamicsand for the understanding of atomic spectra1–6.Identifying the origin of small energy shifts is still importantfor engineered quantum systems, in light of the extreme precisionrequired for applications such as quantum computing7,8.However, it is challenging to resolve the Lamb shift in itsoriginal broadband case in the absence of a tuneable environment.Consequently, previous observations1–5,9 in non-atomicsystems are limited to environments comprising narrowbandmodes10–12. Here, we observe a broadband Lamb shift in highqualitysuperconducting resonators, a scenario also accessingstatic shifts inaccessible in Lamb’s experiment1,2. We measurea continuous change of several megahertz in the fundamentalresonator frequency by externally tuning the couplingstrength to the engineered broadband environment, which isbased on hybrid normal-metal–insulator–superconductor tunneljunctions13–15. Our results may lead to improved control ofdissipation in high-quality engineered quantum systems andopen new possibilities for studying synthetic open quantummatter16–18 using this hybrid experimental platform.
UR - http://www.scopus.com/inward/record.url?scp=85062835854&partnerID=8YFLogxK
U2 - 10.1038/s41567-019-0449-0
DO - 10.1038/s41567-019-0449-0
M3 - Article
JO - Nature Physics
JF - Nature Physics
SN - 1745-2473
ER -