Photon bunching in parametric down-conversion with continuous wave excitation

Details Photon bunching in parametric down-conversion with continuous wave excitation Photon bunching in parametric down-conversion with continuous wave excitation

2008-10-27

arxiv.org/abs/0810.4785v2

Phys. Rev. A 79, 063846 (2009)

Physics

Quantum Physics

7 pages, 4 figures, expanded introduction and experimental details added. Accepted for publication in Phys.Rev.A

Scientific paper

10.1103/PhysRevA.79.063846

The first direct measurement of photon bunching (g2 correlation function) in one output arm of a spontaneous-parametric-down-conversion source operated with a continuous pump laser in the single-photon regime is demonstrated. The result is in agreement with the statistics of a thermal field of the same coherence length, and shows the feasibility of investigating photon statistics with compact cw-pumped sources. Implications for entanglement-based quantum cryptography are discussed.

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