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Il Nuovo cimento della Società italiana di fisica. B/Il Nuovo cimento B

A new equation for quantum dissipative systems

P. Caldirola, E. Montaldi

Published Oct 1, 1979• 41 citations
Publisher
DOI
10.1007/bf02739895

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The time-convolutionless quantum master equation is widely used to simulate reduced dynamics of a quantum system coupled to a bath. However, except for several special cases, applications of this equation are based on perturbative calculation of the dissipative tensor, and are limited to the weak system-bath coupling regime. In this paper, we derive an exact time-convolutionless quantum master equation from the path integral approach, which provides a new way to calculate the dissipative tensor nonperturbatively. Application of the new method is demonstrated in the case of an asymmetrical two-level system linearly coupled to a harmonic bath.