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- W4313304751 abstract "Positivity preservation is naturally guaranteed in exact non-Markovian master equations for open quantum system dynamics. However, in many approximated non-Markovian master equations, the positivity of the reduced density matrix is not guaranteed. In this paper, we provide a general class of time-local, perturbative and positivity-preserving non-Markovian master equations generated from stochastic Schrodinger equations, particularly quantum-state-diffusion equations. Our method has an expanded range of applicability for accommodating a variety of non-Markovian environments. We show the positivity-preserving master equation for a three-level system coupled to a dissipative bosonic environment as a particular example to exemplify our general approach. We illustrate the numerical simulations with an analysis explaining why the previous approximated non-Markovian master equations cannot guarantee positivity. Our work provides a consistent master equation for studying the non-Markovian dynamics in ultrafast quantum processes and strong-coupling systems." @default.
- W4313304751 created "2023-01-06" @default.
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- W4313304751 date "2022-12-27" @default.
- W4313304751 modified "2023-10-16" @default.
- W4313304751 title "Positivity Preserving non-Markovian Master Equation for Open Quantum System Dynamics: Stochastic Schr{o}dinger Equation Approach" @default.
- W4313304751 doi "https://doi.org/10.48550/arxiv.2212.13362" @default.
- W4313304751 hasPublicationYear "2022" @default.
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