Phys. Rev. Lett. 98, 053601 (2007) [4 pages]Four-Wave Mixing and Biphoton Generation in a Two-Level SystemReceived 4 October 2006; published 29 January 2007 We find that in a two-level system there are two kinds of four-wave mixing processes which destructively contribute to the third-order nonlinear susceptibility. In a paired-photon generation scheme by using a single retroreflected pump beam, these two processes occur with definite time orders. The biphoton temporal correlation, which is measured with a back-to-back geometry in a laser-cooled two-level atomic ensemble, shows a damped Rabi oscillation and photon antibunching. Without suppressing the background of Rayleigh scattering, the upper limit of Cauchy criteria is estimated. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.053601
DOI:
10.1103/PhysRevLett.98.053601
PACS:
42.50.Dv, 32.80.−t, 42.65.An, 42.65.Lm
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