53 research outputs found
Quantum dynamics of a qubit coupled with structured bath
The dynamics of an unbiased spin-boson model with Lorentzian spectral density
is investigated theoretically in terms of the perturbation theory based on a
unitary transformation. The non-equilibrium correlation function and
susceptibility are calculated for both the
off-resonance case and the on-resonance case
. The approach is checked by the Shiba's relation and the
sum rule. Besides, the coherent-incoherent transition point can be
determined, which has not been demonstrated for the structured bath by previous
authors up to our knowledge.Comment: 25 pages, 11 figure
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