We identify the conditions that guarantee equivalence of the reduced dynamics of an open quantum system (OQS) for two different types of environments - one a continuous bosonic environment leading to a unitary system-environment evolution and the other a discrete-mode bosonic environment resulting in a system-mode (nonunitary) Lindbladian evolution. Assuming initial Gaussian states for the environments, we prove that the two OQS dynamics are equivalent if both the expectation values and two-time correlation functions of the environmental interaction operators are the same at all times for the two configurations. Since the numerical and analytical description of a discrete-mode environment undergoing a Lindbladian evolution is significantly more efficient than that of a continuous bosonic environment in a unitary evolution, our result represents a powerful, nonperturbative tool to describe complex and possibly highly non-Markovian dynamics. As a special application, we recover and generalize the well-known pseudomodes approach to open-system dynamics.
Nonperturbative Treatment of non-Markovian Dynamics of Open Quantum Systems / D. Tamascelli, A. Smirne, S.F. Huelga, M.B. Plenio. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 120:3(2018), pp. 030402.1-030402.6.
|Titolo:||Nonperturbative Treatment of non-Markovian Dynamics of Open Quantum Systems|
|Parole Chiave:||semigroups; radiation; biology; driven; cavity; model|
|Settore Scientifico Disciplinare:||Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici|
|Data di pubblicazione:||2018|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1103/PhysRevLett.120.030402|
|Appare nelle tipologie:||01 - Articolo su periodico|