Observation of Antinormally Ordered Hanbury-Brown--Twiss Correlations

Details Observation of Antinormally Ordered Hanbury-Brown--Twiss Correlations Observation of Antinormally Ordered Hanbury-Brown--Twiss Correlations

2004-02-05

arxiv.org/abs/quant-ph/0402042v1

Phys. Rev. Lett. 92, 113601 (2004)

Physics

Quantum Physics

5 pages, 3 figures, to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.92.113601

We have measured antinormally ordered Hanbury-Brown--Twiss correlations for coherent states of electromagnetic field by using stimulated parametric down-conversion process. Photons were detected by stimulated emission, rather than by absorption, so that the detection responded not only to actual photons but also to zero-point fluctuations via spontaneous emission. The observed correlations were distinct from normally ordered ones as they showed excess positive correlations, i.e., photon bunching effects, which arose from the thermal nature of zero-point fluctuations.

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