Gauging a quantum heat bath with dissipative Landau-Zener transitions.
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.
Wubs
Martijn
M
Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany.
Saito
Keiji
K
Kohler
Sigmund
S
Hänggi
Peter
P
Kayanuma
Yosuke
Y