Sperling J, Eckstein A, Clements W R, Moore M, Renema J J, Kolthammer W S, Nam S W, Lita A, Gerrits T, Walmsley I A, Agarwal G S, Vogel W
Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, England, United Kingdom.
National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
Phys Rev A (Coll Park). 2017 Jul;96(1). doi: 10.1103/PhysRevA.96.013804. Epub 2017 Jul 6.
In Sperling [Phys. Rev. Lett. , 163602 (2017)], we introduced and applied a detector-independent method to uncover nonclassicality. Here, we extend those techniques and give more details on the performed analysis. We derive a general theory of the positive-operator-valued measure that describes multiplexing layouts with arbitrary detectors. From the resulting quantum version of a multinomial statistics, we infer nonclassicality probes based on a matrix of normally ordered moments. We discuss these criteria and apply the theory to our data which are measured with superconducting transition-edge sensors. Our experiment produces heralded multiphoton states from a parametric down-conversion light source. We show that the known notions of sub-Poisson and sub-binomial light can be deduced from our general approach, and we establish the concept of sub-multinomial light, which is shown to outperform the former two concepts of nonclassicality for our data.
在斯珀林[《物理评论快报》，163602(2017)]中，我们引入并应用了一种与探测器无关的方法来揭示非经典性。在此，我们扩展这些技术，并给出所执行分析的更多细节。我们推导了一种正算子值测度的一般理论，该理论描述了具有任意探测器的复用布局。从所得的多项式统计的量子版本中，我们基于正规序矩矩阵推断出非经典性探测器。我们讨论这些标准，并将该理论应用于我们用超导转变边缘传感器测量的数据。我们的实验从参量下转换光源产生了有 herald 信号的多光子态。我们表明，亚泊松光和亚二项式光的已知概念可以从我们的一般方法中推导出来，并且我们建立了亚多项式光的概念，结果表明，对于我们的数据，亚多项式光在非经典性方面优于前两个概念。
