论文标题
泊松双子束状态和对称光子减法在损耗估计中的影响
Poissonian twin beam states and the effect of symmetrical photon subtraction in loss estimations
论文作者
论文摘要
我们已经设计了一个实验可实现的模型，该模型生成了双子束状态，其单个光束光子统计数据的变化从热量到Poissonian变化，保持非古典模式相关性完整。我们通过考虑三个不同的估计量来研究这些状态对损耗测量的有用性，与自发参数降低转换或四波混合产生的相关热双束状态相比。然后，我们将光子减法操作纳入模型中，并在固定挤压和每个吸收样品的光子暴露下都证明了它们在损失估计中的优势。例如，在固定挤压下，对于两个光子减法，最多可以找到三倍的优势。在后一种情况下，尽管由于光子减法而产生的优势主要是在标准制度中，但意外的结果是，在某些工作状态下，光子减法方案也可以放弃比相关的泊松束结果的20％优势。我们还对这些估计值进行了比较研究，以找到损失估计的最佳测量。我们介绍了模型参数的所有值的结果，将双子束状态的统计数据从热层变为泊松词。
We have devised an experimentally realizable model generating twin beam states whose individual beam photon statistics are varied from thermal to Poissonian keeping the non-classical mode correlation intact. We have studied the usefulness of these states for loss measurement by considering three different estimators, comparing with the correlated thermal twin beam states generated from spontaneous parametric down conversion or four-wave mixing. We then incorporated the photon subtraction operation into the model and demonstrate their advantage in loss estimations with respect to un-subtracted states at both fixed squeezing and per photon exposure of the absorbing sample. For instance, at fixed squeezing, for two photon subtraction, up to three times advantage is found. In the latter case, albeit the advantage due to photon subtraction mostly subsides in standard regime, an unexpected result is that in some operating regimes the photon subtraction scheme can also give up to 20% advantage over the correlated Poisson beam result. We have also made a comparative study of these estimators for finding the best measurement for loss estimations. We present results for all the values of the model parameters changing the statistics of twin beam states from thermal to Poissonian.
