Phys. Rev. A 68, 043813 (2003) [7 pages]Entanglement and four-wave mixing effects in the dissipation-free nonlinear interaction of two photons at a single atomReceived 26 January 2003; published 10 October 2003 We investigate the nonlinear interaction between two photons in a single-input pulse at an atomic two-level nonlinearity. A one-dimensional model for the propagation of light to and from the atom is used to describe the precise spatiotemporal coherence of the two-photon state. It is shown that the interaction generates spatiotemporal entanglement in the output state similar to the entanglement observed in parametric down-conversion. A method of generating photon pairs from coherent pump light using this quantum-mechanical four-wave mixing process is proposed. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.68.043813
DOI:
10.1103/PhysRevA.68.043813
PACS:
42.50.Ct, 32.80.-t, 42.65.-k
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