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, 97 (20), 200404

Gauging a Quantum Heat Bath With Dissipative Landau-Zener Transitions

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Gauging a Quantum Heat Bath With Dissipative Landau-Zener Transitions

Martijn Wubs et al. Phys Rev Lett.

Abstract

We calculate the exact Landau-Zener transition probabilities for a qubit with an arbitrary linear coupling to a bath at zero temperature. The final quantum state exhibits a peculiar entanglement between the qubit and the bath. In the special case of 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.

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