Jian Ma, Zhe Sun, Xiaoguang Wang, Franco Nori
We derive a set of hierarchical equations for qubits interacting with a
Lorentz-broadened cavity mode at zero temperature, without using the
rotating-wave, Born, and Markovian approximations. We use this exact method to
reexamine the entanglement dynamics of two qubits interacting with a common
bath, which was previously solved only under the rotating-wave and
single-excitation approximations. With the exact hierarchy equation method used
here, we observe significant differences in the resulting physics, compared to
the previous results with various approximations. Double excitations due to
counter-rotating-wave terms are also found to have remarkable effects on the
dynamics of entanglement.
View original:
http://arxiv.org/abs/1202.0688
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