Abstract
Single photons are generated from an ensemble of cold Cs atoms via the protocol of Duan et al. [Nature (London) 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 field 2 is demonstrated by the violation of a Cauchy-Schwarz inequality, namely , where describes the detection of two events conditioned upon an initial detection , with for single photons.
- Received 21 January 2004
DOI:https://doi.org/10.1103/PhysRevLett.92.213601
©2004 American Physical Society