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TT: Fachverband Tiefe Temperaturen

TT 28: Transport - Poster Session

TT 28.21: Poster

Donnerstag, 29. März 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).