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284802.0 [No comment] 17.08.2006 14:52 Released

ID: 284802.0, MPI für Kernphysik / Theoretical Quantum Dynamics
Collective coherent population trapping in a thermal field
Authors:Macovei, Mihai; Ficek, Zbigniew; Keitel, Christoph Helmut
Date of Publication (YYYY-MM-DD):2006-06-22
Title of Journal:Physical Review A
Journal Abbrev.:Phys. Rev. A
Sequence Number of Article:063821
Copyright:©2006 The American Physical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We analyze the efficiency of coherent population trapping (CPT) in a superposition of the ground states of three-level atoms under the influence of the decoherence process induced by a broadband thermal field. We show that in a single atom there is no perfect CPT when the atomic transitions are affected by the thermal field. The perfect CPT may occur when only one of the two atomic transitions is affected by the thermal field. In the case when both atomic transitions are affected by the thermal field, we demonstrate that regardless of the intensity of the thermal field the destructive effect on the CPT can be circumvented by the collective behavior of the atoms. An analytic expression was obtained for the populations of the upper atomic levels which can be considered as a measure of the level of thermal decoherence. The results show that the collective interaction between the atoms can significantly enhance the population trapping in that the population of the upper state decreases with an increased number of atoms. The physical origin of this feature is explained by the semiclassical dressed-atom model of the system. We introduce the concept of multiatom collective coherent population trapping by demonstrating the existence of collective (entangled) states whose storage capacity is larger than that of the equivalent states of independent atoms.
External Publication Status:published
Document Type:Article
Communicated by:C.H. Keitel
Affiliations:MPI für Kernphysik/ Group C.H. Keitel/Quantum Interferences and Collective Quantum Dynamics (J. Evers)
External Affiliations:Department of Physics, School of Physical Sciences, The University of Queensland, Brisbane, Australia 4072