Detection of sub-shot-noise spatial correlation in high-gain parametric down-conversion

Details Detection of sub-shot-noise spatial correlation in high-gain parametric down-conversion Detection of sub-shot-noise spatial correlation in high-gain parametric down-conversion

2004-07-27

arxiv.org/abs/quant-ph/0407211v1

Physics

Quantum Physics

4,2 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.93.243601

Using a 1GW-1ps pump laser pulse in high gain parametric down-conversion allows us to detect sub-shot-noise spatial quantum correlation with up to one hundred photoelectrons per mode, by means of a high efficiency CCD. The statistics is performed in single-shot over independent spatial replica of the system. The paper highlights the evidence of quantum correlation between symmetrical signal and idler spatial areas in the far field, in the high gain regime. In accordance with the predictions of numerical calculations the observed transition from the quantum to the classical regime is interpreted as a consequence of the narrowing of the down-converted beams in the very high gain regime.

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