Frick Stefan, McMillan Alex, Rarity John
Opt Express. 2020 Dec 7;28(25):37118-37128. doi: 10.1364/OE.399902.
Quantum light generated in non-degenerate squeezers has many applications such as sub-shot-noise transmission measurements to maximise the information extracted by one photon or quantum illumination to increase the probability in target detection. However, any application thus far fails to consider the thermal characteristics of one half of the bipartite down-converted photon state often used in these experiments. We show here that a maximally mixed state, normally viewed as nuisance, can indeed be used to extract information about the position of an object while at the same time providing efficient camouflaging against other thermal or background light.
在非简并压缩器中产生的量子光有许多应用，比如进行亚散粒噪声传输测量以最大化单个光子提取的信息，或者进行量子照明以提高目标检测的概率。然而，迄今为止的任何应用都未能考虑这些实验中常用的二分下转换光子态的一半的热特性。我们在此表明，通常被视为干扰的最大混合态确实可用于提取物体位置的信息，同时能有效伪装以抵御其他热光或背景光。
