Quantum spatial correlations in high-gain parametric down-conversion measured by means of a CCD camera
arXiv:quant-ph/0502047 · doi:10.1080/09500340500217670
Abstract
We consider travelling-wave parametric down-conversion in the high-gain regime and present the experimental demonstration of the quantum character of the spatial fluctuations in the system. In addition to showing the presence of sub-shot noise fluctuations in the intensity difference, we demonstrate that the peak value of the normalized spatial correlations between signal and idler lies well above the line marking the boundary between the classical and the quantum domain. This effect is equivalent to the apparent violation of the Cauchy-Schwartz inequality, predicted by some of us years ago, which represents a spatial analogue of photon antibunching in time. Finally, we analyse numerically the transition from the quantum to the classical regime when the gain is increased and we emphasize the role of the inaccuracy in the determination of the symmetry center of the signal/idler pattern in the far-field plane.
21 pages, 11 figures, submitted to J. Mod. Opt. special issue on Quantum Imaging
References in corpus (8)
- Correlated imaging, quantum and classical
- Experimental evidence of high-resolution ghost imaging and ghost diffraction with classical thermal light
- Quantum Imaging
- Surpassing the standard quantum limit for optical imaging using non-classical multimode light
- Detection of sub-shot-noise spatial correlation in high-gain parametric down-conversion
- Simultaneous near-field and far field spatial quantum correlations in spontaneous parametric down-conversion
- Quantum Holography
- Experimental observation of spatial antibunching of photons
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