论文标题
使用量子光态的两个复制品对正交相干量表进行干涉测量
Interferometric measurement of the quadrature coherence scale using two replicas of a quantum optical state
论文作者
论文摘要
评估量子状态$ \ hatρ$是否是非经典的（$ \ textit {i.e。} $，与相干状态的混合不兼容）是一个无处不在的量子光学问题问题，但由于许多非典型的证人是$ \ hat phat pρ$ρ$的非平常实验任务。特别是，如果我们想通过评估其正交相干量表来见证或衡量状态的非经典性，则此$ \ textit {a先验} $需要完整的状态断层扫描。在这里，我们提供了一个实验过程，可以使用简单的线性干涉仪直接访问该数量，该干涉仪涉及补充的状态$ \ hatρ$的两个复制品（独立且相同的副本），并补充了具有光子数清分测量的测量。这一发现我们将其解释为洪 - 曼德尔效应的扩展，它说明了多拷贝干涉技术的广泛适用性，以便在量子光学方面绕过状态层析成像。
Assessing whether a quantum state $\hat ρ$ is nonclassical ($\textit{i.e.}$, incompatible with a mixture of coherent states) is a ubiquitous question in quantum optics, yet a nontrivial experimental task because many nonclassicality witnesses are nonlinear in $\hat ρ$. In particular, if we want to witness or measure the nonclassicality of a state by evaluating its quadrature coherence scale, this $\textit{a priori}$ requires full state tomography. Here, we provide an experimental procedure for directly accessing this quantity with a simple linear interferometer involving two replicas (independent and identical copies) of the state $\hat ρ$ supplemented with photon-number-resolving measurements. This finding, which we interpret as an extension of the Hong-Ou-Mandel effect, illustrates the wide applicability of the multicopy interferometric technique in order to circumvent state tomography in quantum optics.
