Journal
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
Volume 48, Issue 27, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1751-8113/48/27/275304
Keywords
open quantum system; reduced dynamics; quasi degenerate energies; overlapping resonances; quasi stationary states
Categories
Funding
- NSERC
- Center for Nonlinear Studies of LANL
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We consider a three-level quantum system interacting with a bosonic thermal reservoir. Two energy levels of the system are nearly degenerate but well separated from the third one. The system-reservoir interaction constant is larger than the energy difference of the degenerate levels, but it is smaller than the separation between the latter and the remaining level. We show that the quasi-degeneracy of energy levels leads to the existence of a manifold of quasi-stationary states, and the dynamics exhibits two characteristic time scales. On the first, shorter one, initial states approach the quasi-stationary manifold. Then, on the much longer second time scale, the final unique equilibrium is reached.
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