Radiation Pressure as a Source of Decoherence

Details Radiation Pressure as a Source of Decoherence Radiation Pressure as a Source of Decoherence

2000-04-12

arxiv.org/abs/quant-ph/0004057v1

Phys.Rev.A62:042103,2000

Physics

Quantum Physics

14 pages, 3 figures, RevTex file

Scientific paper

10.1103/PhysRevA.62.042103

We consider the interaction of an harmonic oscillator with the quantum field via radiation pressure. We show that a `Schrodinger cat' state decoheres in a time scale that depends on the degree of `classicality' of the state components, and which may be much shorter than the relaxation time scale associated to the dynamical Casimir effect. We also show that decoherence is a consequence of the entanglement between the quantum states of the oscillator and field two-photon states. With the help of the fluctuation-dissipation theorem, we derive a relation between decoherence and damping rates valid for arbitrary values of the temperature of the field. Coherent states are selected by the interaction as pointer states.

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