Berlin 2012 – wissenschaftliches Programm

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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: Vortrag

Montag, 26. März 2012, 11:15–11:30, BH 243

Measurement scheme for the Lamb shift in a superconducting circuit with broadband environment — •Vera Gramich¹, Paolo Solinas^2,3, Mikko Möttönen^2,3, 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).