dorsal/arxiv
View SchemaCollective coherent population trapping in a thermal field
| Authors | M. Macovei, Z. Ficek, C. H. Keitel |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0606013 |
| URL | https://arxiv.org/abs/quant-ph/0606013 |
| DOI | 10.1103/PhysRevA.73.063821 |
| Journal | Phys. Rev. A 73, 063821 (2006) |
Abstract
We analyzed 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 showed 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 demonstrated 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 increased number of atoms. The physical origin of this feature was explained by the semiclassical dressed atom model of the system. We introduced 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.
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"abstract": "We analyzed the efficiency of coherent population trapping (CPT) in a\nsuperposition of the ground states of three-level atoms under the influence of\nthe decoherence process induced by a broadband thermal field. We showed that in\na single atom there is no perfect CPT when the atomic transitions are affected\nby the thermal field. The perfect CPT may occur when only one of the two atomic\ntransitions is affected by the thermal field. In the case when both atomic\ntransitions are affected by the thermal field, we demonstrated that regardless\nof the intensity of the thermal field the destructive effect on the CPT can be\ncircumvented by the collective behavior of the atoms. An analytic expression\nwas obtained for the populations of the upper atomic levels which can be\nconsidered as a measure of the level of thermal decoherence. The results show\nthat the collective interaction between the atoms can significantly enhance the\npopulation trapping in that the population of the upper state decreases with\nincreased number of atoms. The physical origin of this feature was explained by\nthe semiclassical dressed atom model of the system. We introduced the concept\nof multiatom collective coherent population trapping by demonstrating the\nexistence of collective (entangled) states whose storage capacity is larger\nthan that of the equivalent states of independent atoms.",
"arxiv_id": "quant-ph/0606013",
"authors": [
"M. Macovei",
"Z. Ficek",
"C. H. Keitel"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.73.063821",
"journal_ref": "Phys. Rev. A 73, 063821 (2006)",
"title": "Collective coherent population trapping in a thermal field",
"url": "https://arxiv.org/abs/quant-ph/0606013"
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