Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-09-21
Phys. Rev. A 84, 052103 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 4 figures
Scientific paper
10.1103/PhysRevA.84.052103
Motivated by recent experiments on quantum mechanical charge pumping in a Cooper pair sluice, we present a measurement scheme for observing shifts of transition frequencies in two-level quantum systems induced by broadband environmental fluctuations. In contrast to quantum optical and related set-ups based on cavities, the impact of a thermal phase reservoir is considered. A thorough analysis of Lamb and Stark shifts within weak-coupling master equations is complemented by non-perturbative results for the model of an exactly solvable harmonic system. The experimental protocol to measure the Lamb shift in experimentally feasible superconducting circuits is analysed in detail and supported by numerical simulations.
Ankerhold Joachim
Gramich V.
Mottonen Mikko
Pekola Jukka P.
Solinas Paolo
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