6533b7d5fe1ef96bd126496b
RESEARCH PRODUCT
Loss of coherence and dressing in QED
Giuseppe CompagnoFrancesco PetruccioneBruno Bellomosubject
Electromagnetic fieldPhysicsDensity matrixQuantum PhysicsPhotonQuantum decoherenceoscillatorsWave packetVirtual particleFOS: Physical sciencesAtomic and Molecular Physics and OpticsCharged particleharmonic oscillatorsQuantum electrodynamicsQuantum mechanicsbathsQuantum Physics (quant-ph)Coherence (physics)description
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-01-01 |