Loss of coherence and dressing in QED

Details Loss of coherence and dressing in QED Loss of coherence and dressing in QED

2006-12-22

arxiv.org/abs/quant-ph/0612192v1

Phys. Rev. A 74, 052112 (2006)

Physics

Quantum Physics

16 pages, 4 figures

Scientific paper

10.1103/PhysRevA.74.052112

The dynamics of a free charged particle, initially described by a coherent wave packet, interacting with an environment, i.e. the electromagnetic field characterized by a temperature $T$, is studied. Using the dipole approximation the exact expressions for the evolution of the reduced density matrix both in momentum and configuration space and the vacuum and the thermal contribution to decoherence, are obtained. The time behaviour of the coherence lengths in the two representations are given. Through the analysis of the dynamic of the field structure associated to the particle the vacuum contribution is shown to be linked to the birth of correlations between the single momentum components of the particle wave packet and the virtual photons of the dressing cloud.

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