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arXiv:quant-ph/0605131

Comment on "Can Two-Photon Correlation of Chaotic Light be Considered as Correlation of Intensity Fluctuations ?"

Avi Pe’er

Published May 15, 2006• 1 citation
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Abstract

A Comment on the Letter by G. Scarcelli, V. Berardi and Y. Shih, Phys. Rev. Lett. 96, 063602 (2006).
DOI
10.48550/arxiv.quant-ph/0605131

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In a recent Letter (Phys. Rev. Lett. \textbf{98}, 083601 (2007), arXiv:cond-mat/0610804), O. Assaf and E. Akkermans claim that the angular correlations of the light intensity scattered by a cloud of cold atoms with internal degeneracy (Zeeman sublevels) of the ground state overcome the usual Rayleigh law. More precisely, they found that they become exponentially large with the size of the sample. In what follows, we will explain why their results are wrong and, in contrary, why the internal degeneracy leads to lower intensity correlations.
A recent article by Shih, Sergienko, and Rubin [Phys. Rev. A 47, 1288 (1993)] reports a two-photon interference effect in which fringes with a visibility of 59% were observed; for an ideal system, quantum mechanics predicts perfect visibility interference. In explanation of this discrepancy, the authors conclude that the reduced visibility is due to ``nonperfect phase matching of the down-conversion,'' the parent process of the correlated photon pairs. They imply that the nonperfect phase matching stems from the finite size of their down-conversion crystal. We argue that the crystal length was not a limiting factor in their measurement, citing three similar experiments which achieved higher visibilities [Kwiat, Steinberg, and Chiao, Phys. Rev. A 47, R2472 (1993); Brendel, Mohler, and Martienssen, Phys. Rev. Lett. 66, 1142 (1991); Europhys. Lett. 20, 575 (1992)].