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TT: Fachverband Tiefe Temperaturen
TT 28: Transport - Poster Session
TT 28.21: Poster
Thursday, March 29, 2007, 14:00–17:45, Poster A
Gauging a quantum heat bath with dissipative Landau-Zener transitions — •Martijn Wubs1, Keiji Saito2, Sigmund Kohler1, Peter Hänggi1, and Yosuke Kayanuma3 — 1Institut für Physik, Universität Augsburg — 2University of Tokyo, Japan — 3Osaka Prefecture University, Japan
We calculate the exact Landau-Zener transition probabilities for a qubit with arbitrary linear coupling to a bath at zero temperature [1]. The final quantum state exhibits a peculiar entanglement between the qubit and the bath. In the special case of a diagonal coupling, the bath does not influence the transition probability, whatever the speed of the Landau-Zener sweep. It is proposed to use Landau-Zener transitions to determine both the reorganization energy and the integrated spectral density of the bath. Possible applications include circuit QED and molecular nanomagnets.
[1] M. Wubs et al., Phys. Rev. Lett. 97, 200404 (2006).