Quantum Continual Measurements and a Posteriori Collapse on CCR

Details Quantum Continual Measurements and a Posteriori Collapse on CCR Quantum Continual Measurements and a Posteriori Collapse on CCR

2005-12-21

arxiv.org/abs/math-ph/0512070v1

Communications Mathematical Physics 146, pp 611--635 (1992)

Physics

Mathematical Physics

25 pages. See also related papers at http://www.maths.nott.ac.uk/personal/vpb/research/fil_con.html and http://www.maths.not

Scientific paper

10.1007/BF02097018

A quantum theory for the Markovian dynamics of an open system under the unsharp observation which is continuous in time, is developed within the CCR stochastic approach. A stochastic classical equation for the posterior evolution of quantum continuously observed system is derived and the spontaneous collapse (stochastically continuous reduction of the wave packet) is described. The quantum Langevin evolution equation is solved for the general linear case of a quasi--free Hamiltonian in the initial CCR algebra with a fixed output observable field, and the posterior Kalman dynamics coresponding to an initial Gaussian state is found. It is shown for an example of the posterior dynamics of quantum unstable open system that any mixed state under a complete nondemolition measurement collapses exponentially to a pure Gaussian one.

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