Entanglement and four-wave mixing effects in the dissipation-free nonlinear interaction of two photons at a single atom

Holger F. Hofmann; Kunihiro Kojima; Shigeki Takeuchi; Keiji Sasaki

doi:10.1103/PhysRevA.68.043813

Entanglement and four-wave mixing effects in the dissipation-free nonlinear interaction of two photons at a single atom

Holger F. Hofmann, Kunihiro Kojima, Shigeki Takeuchi, and Keiji Sasaki

Phys. Rev. A 68, 043813 – Published 10 October 2003

Abstract

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.

Received 26 January 2003

DOI:https://doi.org/10.1103/PhysRevA.68.043813

Authors & Affiliations

Holger F. Hofmann^1,2,*, Kunihiro Kojima², Shigeki Takeuchi^1,2, and Keiji Sasaki²

¹PRESTO, Japan Science and Technology Corporation (JST), Hokkaido University, Kita-12 Nishi-6, Kita-ku, Sapporo 060-0812, Japan
²Research Institute for Electronic Science, Hokkaido University, Kita-12 Nishi-6, Kita-ku, Sapporo 060-0812, Japan

^*Email address: h.hofmann@osa.org

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Vol. 68, Iss. 4 — October 2003

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