Physics – Quantum Physics
Scientific paper
2000-03-11
Phys. Rev. A, 62(2000) 013819
Physics
Quantum Physics
10 pages, 1 figure
Scientific paper
10.1103/PhysRevA.62.013819
We construct generally applicable small-loss rate expansions for the density operator of an open system. Successive terms of those expansions yield characteristic loss rates for dissipation processes. Three applications are presented in order to give further insight into the context of those expansions. The first application, of a two-level atom coupling to a bosonic environment, shows the procedure and the advantage of the expansion, whereas the second application that consists of a single mode field in a cavity with linewidth $\kappa$ due to partial transmission through one mirror illustrates a practical use of those expansions in quantum measurements, and the third one, for an atom coupled to modes of a lossy cavity shows the another use of the perturbative expansion.
Li Camille
Su Jun-Chen
Yi Xiaoke
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