Quantum regression beyond the Born-Markov approximation for generalized spin-boson models
arXiv:2201.12326 · doi:10.1103/PhysRevA.105.052435
Abstract
The quantum regression formula for an open quantum system consists in an infinite hierarchy of conditions for its multi-time correlation functions, thus requiring full access to the total "system+environment" evolution, and providing a stronger requirement than CP-divisibility. Here, we analyze CP-divisibility and check the validity of quantum regression beyond the Born-Markov approximation (e.g. weak coupling limit) for a class of generalized spin-boson (GSB) models giving rise to a multi-level amplitude-damping evolution; in all cases, it is possible to engineer the system-bath coupling in such a way that quantum regression is exactly satisfied.
arXiv comment9 pages; to appear in Phys. Rev. A
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