arXiv quant-ph/05020472005-02-08quant-ph

用CCD相机测量高增益参量下转换中的量子空间相关

Quantum spatial correlations in high-gain parametric down-conversion measured by means of a CCD camera

O. Jedrkiewicz, E. Brambilla, M. Bache, A. Gatti, L. A. Lugiato, P. Di Trapani

备注：: 21 pages, 11 figures, submitted to J. Mod. Opt. special issue on Quantum Imaging
发表信息：: Journal of Modern Optics 53, 575-595 (2006)
DOI：: 10.1080/09500340500217670

摘要：

我们考虑行波参量下转换在高增益制度，并提出了实验证明的量子特性的空间波动的系统。除了显示存在的子散粒噪声波动的强度差，我们证明了信号和空闲之间的归一化空间相关性的峰值位于远高于线标记的经典和量子域之间的边界。这种效应相当于我们中的一些人多年前预测的柯西-施瓦茨不等式的明显违反，它代表了光子反聚束在时间上的空间模拟。最后，我们数值分析从量子过渡到经典制度时，增益的增加，我们强调的不准确性的作用，在远场平面中的信号/空闲模式的对称中心的确定。

英文摘要：

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.

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英文摘要：

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