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Bulletin of the Russian Academy of Sciences Physics

Spontaneous coherent trapping of population in the system of atoms + field

A.V. Tajchenachev, A.M. Tumajkin, Valeriy I. Yudin

Published Jan 1, 1996• 0 citations
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In this research, the disentanglement conditions between the coated atom and its spontaneous emission in double- lambda quantum system was investigated. Initially, the entanglement increased due to the interaction between the laser fields and the four- level atom. This entanglement can be controlled by changing the intensity of the applied fields. By applying the two coupling fields, the system is entangled and the system would be disentangled with one coupling field and one probe field. The present research demonstrated that spontaneous emission by changing the population of atoms in the alignments is a good source of entanglement, but fields were manipulated in such a way that this entanglement was reduced by coherent trapping of the population for the atoms.
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For jg equals j yields je equals j - 1 and jg equals j yields je equals j optical transitions (where jg, je are the total angular momenta of ground (g) and excited (e) states) previously unknown exact solution of quantum self-consistent problem on resonant atom-electromagnetic field interaction is found. This solution describes arbitrary set of field modes having same uniform elliptical polarization and atoms being in noninteracting with field coherent population trapping (CPT)-state. Some peculiarities of this spontaneous CPT-effect are investigated. We define the geometrical conditions (the relative orientation of light and static fields) for the existence of spontaneous CPT-effect in atoms + quantized field system in the presence of external static magnetic and electric fields.