Linear stochastic wave-equations for continuously measured quantum systems

Details Linear stochastic wave-equations for continuously measured quantum systems Linear stochastic wave-equations for continuously measured quantum systems

1994-04-26

arxiv.org/abs/gr-qc/9404054v3

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

34 pages, Revtex

Scientific paper

10.1103/PhysRevA.50.5242

While the linearity of the Schr\"odinger equation and the superposition principle are fundamental to quantum mechanics, so are the backaction of measurements and the resulting nonlinearity. It is remarkable, therefore, that the wave-equation of systems in continuous interaction with some reservoir, which may be a measuring device, can be cast into a linear form, even after the degrees of freedom of the reservoir have been eliminated. The superposition principle still holds for the stochastic wave-function of the observed system, and exact analytical solutions are possible in sufficiently simple cases. We discuss here the coupling to Markovian reservoirs appropriate for homodyne, heterodyne, and photon counting measurements. For these we present a derivation of the linear stochastic wave-equation from first principles and analyze its physical content.

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