Atomic entanglement generation with reduced decoherence via four-wave mixing

Details Atomic entanglement generation with reduced decoherence via four-wave mixing Atomic entanglement generation with reduced decoherence via four-wave mixing

2006-04-26

arxiv.org/abs/quant-ph/0604192v1

Phys. Rev. A 73, 063828 (2006)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.73.063828

In most proposals for the generation of entanglement in large ensembles of atoms via projective measurements, the interaction with the vacuum is responsible for both the generation of the signal that is detected and the spin depolarization or decoherence. In consequence, one has to usually work in a regime where the information aquisition via detection is sufficiently slow (weak measurement regime) such as not to strongly disturb the system. We propose here a four-wave mixing scheme where, owing to the pumping of the atomic system into a dark state, the polarization of the ensemble is not critically affected by spontaneous emission, thus allowing one to work in a strong measurement regime.

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