The Lindblad and Redfield forms without secular approximation derived from Born-Markov master equation and their applications

TL;DR

This paper derives more accurate Lindblad and Redfield master equations without secular approximation from the Born-Markov framework, incorporating complex coefficients, and demonstrates their improved predictive power in quantum system dynamics.

Contribution

It introduces a method to derive Lindblad and Redfield forms with complex coefficients without secular approximation from the Born-Markov master equation.

Findings

Non-secular equations predict dynamics more accurately.

Traditional equations deviate from actual dynamics.

Complex coefficients are essential for precise modeling.

Abstract

In this paper we derive the Lindblad and Redfield forms with and without secular approximation from the Born-Markov master equation for open quantum systems. The spectral correlation tensor of bath (the Fourier transform of the bath correlation function) and then the coefficients in the two forms of the master equation are reevaluated according to the scheme in Ref.[Phys. Rev. A 99, 022118 (2019)]. They are complex numbers rather than the real numbers getting from traditional simplified methods. The dynamics of two models [one is an open three-level quantum system model, and the other is the model of phycoerythrin 545 (PE545) of modeling a photosynthesis reaction center] are studied by using the obtained equations. The non-secular Lindblad and Redfield equations with the complex coefficients predict almost the same dynamical results from the Born-Markov master equation. However, the results obtained from the traditional Lindblad and Redfield equations deviate the actual dynamics of the open quantum systems.