量子纠缠与经典关联在双光子关联成像中的作用

Role of Quantum Entanglement and Classical Correlation in Two-photon Imaging

关联成像引起了人们广泛的兴趣,特别是,二阶关联成像是一种纯粹的量子效应还是也可能是一种经典效应还存在争议。本文分析了三种关联成像方案,其中前两种方案中用经典关联和量子纠缠的双光子光源都能成像,而第三种只能用量子纠缠的双光子光源才能成像。对比发现,纠缠双光子同时存在动量和坐标两个自由度上的关联,在三种成像方案中都可用作光源。而经典关联的双光子不具有动量和坐标的双重关联,而仅仅存在其中一种关联(经典关联),关联成像的方式也因此受到限制。

The correlated imaging is an interesting topic. Whether second correlated imaging is a pure quantum effect or classical effect is still implicit. One phenomenon of quantum theory or classical theory, which is an interesting topic. This paper analyses three correlated imaging schemes together. The first two schemes can be achieved by two-photon which is classical correlated or quantum entangled and the third one can only be achieved by entangled two-photon. Through the comparison of these schemes, we find that entangled two-photon which can be used in all the three schemes is correlated both in position and momentum. However, the classical correlated two-photon only correlate in position or momentum, and only can be used in one scheme.