Coherence and Fluctuations in the Interaction between Moving Atoms and a Quantum Field

Details Coherence and Fluctuations in the Interaction between Moving Atoms and a Quantum Field Coherence and Fluctuations in the Interaction between Moving Atoms and a Quantum Field

1997-10-27

arxiv.org/abs/quant-ph/9710061v1

Physics

Quantum Physics

12 pages, Latex

Scientific paper

Mesoscopic physics deals with three fundamental issues: quantum coherence, fluctuations and correlations. Here we analyze these issues for atom optics, using a simplified model of an assembly of atoms (or detectors, which are particles with some internal degree of freedom) moving in arbitrary trajectories in a quantum field. Employing the influence functional formalism, we study the self-consistent effect of the field on the atoms, and their mutual interactions via coupling to the field. We derive the coupled Langevin equations for the atom assemblage and analyze the relation of dissipative dynamics of the atoms with the correlation and fluctuations of the quantum field. This provides a useful theoretical framework for analysing the coherent properties of atom-field systems.

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