A modern review of the two-level approximation

Simple item page
dc.creatorFrasca, Marco
dc.date2002-09-06
dc.date2003-02-27
dc.date.accessioned2026-07-07T06:04:55Z
dc.date.available2026-07-07T06:04:55Z
dc.descriptionThe paradigm of the two-level atom is revisited and its perturbative analysis is discussed in view of the principle of duality in perturbation theory. The models we consider are a two-level atom and an ensemble of two-level atoms both interacting with a single radiation mode. The aim is to see how the latter can be actually used as an amplifier of quantum fluctuations to the classical level through the thermodynamic limit of a very large ensemble of two-level atoms [M. Frasca, Phys. Lett. A {\bf 283}, 271 (2001)] and how can remove Schrödinger cat states. The thermodynamic limit can be very effective for producing both classical states and decoherence on a quantum system that evolves without dissipation. Decoherence without dissipation is indeed an effect of a single two-level atom interacting with an ensemble of two-level atoms, a situation that proves to be useful to understand recent experiments on nanoscale devices showing unexpected disappearance of quantum coherence at very low temperatures.
dc.description20 pages, no figures. Revised version accepted for publication in Annals of Physics
dc.identifierhttps://arxiv.org/abs/quant-ph/0209056
dc.identifierhttp://arxiv.org/abs/quant-ph/0209056
dc.identifierAnnals of Physics 306, 193-208 (2003)
dc.identifierdoi:10.1016/S0003-4916(03)00078-2
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/90479
dc.subjectQuantum Physics
dc.subjectMesoscale and Nanoscale Physics
dc.subjectMathematical Physics
dc.subjectAtomic Physics
dc.titleA modern review of the two-level approximation
dc.typetext

Files

Collections

arXiv