Generalized Master Equations for Driven System

概要

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Time-convolutionless forms of the quantal master equations for driven opensystem are derived from the Liouville equation for the total system under an arbitraryinitial condition for the two cases of weak external driving fields and of arbitraryones. They have forms convenient for the perturbational expansions, and are respeclively compared with the time-convolution forms of equations in the lowest Born ap-proximation for the interaction X.. of the system with its surroundings. It is shownthat the time-convolutionless forms of equations prevail over the time-convolutionones, and that the conventional Markoffian approximation for the latter in the nar-rowing limit leads to the incorrect conclusion. The time-convolutionless form ofmaster equation is expanded up to o-th order in powers of the external driving fieldsin the lowest Born approximation for X...
社団法人日本物理学会の論文
1986-06-15