Single-Photon Generation from Stored Excitation in an Atomic Ensemble

Details Single-Photon Generation from Stored Excitation in an Atomic Ensemble Single-Photon Generation from Stored Excitation in an Atomic Ensemble

2004-01-23

arxiv.org/abs/quant-ph/0401147v2

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.92.213601

Single photons are generated from an ensemble of cold Cs atoms via the protocol of Duan et al. [Nature \textbf{414}, 413 (2001)]. Conditioned upon an initial detection from field 1 at 852 nm, a photon in field 2 at 894 nm is produced in a controlled fashion from excitation stored within the atomic ensemble. The single-quantum character of the field 2 is demonstrated by the violation of a Cauchy-Schwarz inequality, namely $w(1_{2},1_{2}|1_{1})=0.24\pm 0.05\ngeq 1$, where $w(1_{2},1_{2}|1_{1})$ describes detection of two events $(1_{2},1_{2})$ conditioned upon an initial detection $1_{1}$, with $w\to 0$ for single photons.

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