Non-Markovian quantum trajectories, instruments and time-continuous measurements

Details Non-Markovian quantum trajectories, instruments and time-continuous measurements Non-Markovian quantum trajectories, instruments and time-continuous measurements

2011-09-07

arxiv.org/abs/1109.1338v1

Physics

Quantum Physics

19 pages

Scientific paper

The linear and the nonlinear non-Markovian quantum state diffusion equation (NMQSD) are well known tools for the description of certain non-Markovian open quantum systems. In this work, we systematically investigate whether the normalized linear NMQSD or the nonlinear NMQSD solutions can be generated by means of a time-continuous measurement. By considering any conceivable measurement scheme in the framework of instruments, we derive a necessary criterion for a measurement interpretation of both equations. Concrete examples show that the normalized linear NMQSD solutions are realizable only in the Markovian limit in general. The application of the presented criterion to the nonlinear NMQSD remains an open issue.

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