Conditional preparation of maximal polarization entanglement
Conditional preparation of maximal polarization entanglement
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DOI：
10.1103/physreva.67.030101
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发表时间：
2002-07
影响因子：
2.9
通讯作者：
C. Śliwa;K. Banaszek
中科院分区：
文献类型：
--
作者：
C. Śliwa;K. Banaszek
提出了一种由自发参量下转换光源和无源线性光学器件组成的简单实验装置，用于有条件制备两光子的最大纠缠偏振态。成功的制备是明确预示着四个辅助光子的同时检测。所提出的方案利用对应于三对光子的产生的下转换项。我们分析了辅助光子的不完美探测，并证明了它对预备态保真度的有害影响可以以降低方案效率为代价来抑制。
A simple experimental setup consisting of a spontaneous parametric down-conversion source and passive linear optics is proposed for conditional preparation of a maximally entangled polarization state of two photons. Successful preparation is unambiguously heralded by coincident detection of four auxiliary photons. The proposed scheme utilizes the down-conversion term corresponding to the generation of three pairs of photons. We analyze imperfect detection of the auxiliary photons and demonstrate that its deleterious effect on the fidelity of the prepared state can be suppressed at the cost of decreasing the efficiency of the scheme.