Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 5: Transport: Quantum Coherence and Quantum Information Systems 1 (jointly with MA and HL)
TT 5.7: Talk
Monday, March 26, 2012, 11:15–11:30, BH 243
Measurement scheme for the Lamb shift in a superconducting circuit with broadband environment — •Vera Gramich1, Paolo Solinas2,3, Mikko Möttönen2,3, Jukka Pekola3, and Joachim Ankerhold1 — 1Institut für Theoretische Physik, Universität Ulm, Albert-Einstein-Allee 11, 89069 Ulm, Germany — 2Department of Applied Physics/COMP, Aalto University, P.O. Box 14100, FI-00076 Aalto, Finland — 3Low Temperature Laboratory, Aalto University, P.O. Box 13500, FI-00076 Aalto, Finland
Motivated by recent experiments on quantum mechanical charge pumping in a Cooper pair sluice [1], 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 setups based on cavities, the impact of a thermal phase reservoir is considered. The experimental protocol to measure the Lamb shift in experimentally feasible superconducting circuits is analyzed in detail and supported by numerical simulations
[2]. Therefore, we turn our attention to a brief description of the actual setup followed by an analysis of the detection proposal.
A. O. Niskanen, J. P. Pekola, and H. Seppä, Phys. Rev. Lett. 91, 177003 (2003).
V. Gramich, P. Solinas, M. Möttönen, J. P. Pekola, and J. Ankerhold, Phys. Rev. A 84, 052103 (2011).