Quantum coherence and population trapping in three-photon processes

Details Quantum coherence and population trapping in three-photon processes Quantum coherence and population trapping in three-photon processes

2006-07-30

arxiv.org/abs/quant-ph/0607218v2

Phys. Rev. A 74, 053404 (2006)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.74.053404

The spectroscopic properties of a single, tightly trapped atom are studied, when the electronic levels are coupled by three laser fields in an $N$-shaped configuration of levels, whereby a $\Lambda$-type level system is weakly coupled to a metastable state. We show that depending on the laser frequencies the response can be tuned from coherent population trapping at two-photon resonance to novel behaviour at three photon resonance, where the metastable state can get almost unit occupation in a wide range of parameters. For certain parameter regimes the system switches spontaneously between dissipative and coherent dynamics over long time scales.

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