Entanglement by a beam splitter: Nonclassicality as a prerequisite for entanglement
Entanglement by a beam splitter: Nonclassicality as a prerequisite for entanglement
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DOI：
10.1103/physreva.65.032323
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发表时间：
2002-03-01
影响因子：
2.9
通讯作者：
Knight, PL
中科院分区：
文献类型：
--
作者：
Kim, MS;Son, W;Knight, PL
光束分离器是一种简单，容易获得的设备，可以用来纠缠输出光场。我们表明，要纠缠的光束分离器输出处的磁场的必要条件是，纯输入状态表现出非经典行为。我们将此证明概括为任意（纯或不纯）的高斯输入状态。具体而言，输入高斯磁场的非经典性是借助光束分离器纠缠磁场模式的必要条件。我们猜想这是光束拆分器的一般属性：输入的非经典性是在光束分离器中纠缠磁场的必要条件。
A beam splitter is a simple, readily available device which can act to entangle output optical fields. We show that a necessary condition for the fields at the output of the beam splitter to be entangled is that the pure input states exhibit nonclassical behavior. We generalize this proof for arbitrary (pure or impure) Gaussian input states. Specifically, nonclassicality of the input Gaussian fields is a necessary condition for entanglement of the field modes with the help of a beam splitter. We conjecture that this is a general property of beam splitters: Nonclassicality of the inputs is a necessary condition for entangling fields in a beam splitter.