Thomas P J, Chunnilall C J, Stothard D J M, Walsh D A, Dunn M H
National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, UK.
Opt Express. 2010 Dec 6;18(25):26600-12. doi: 10.1364/OE.18.026600.
The design and implementation of a novel source of degenerate polarization entangled photon pairs in the telecom band, based on a cavity enhanced parametric downconversion process, is presented. Two of the four maximally entangled Bell states are produced; the remaining two are obtainable by the addition of a half wave plate into the setup. The coincident photon detection rate in the A/D basis between two detectors at the output of the device revealed the production of highly entangled states, resulting in quantum interference visibilities of 0.971 ± 0.041 (ϕ = 0 state) and 0.932 ± 0.036 (ϕ = π state) respectively. The entangled states were found to break the Clauser-Horne-Shimony-Holt (CHSH) Bell inequality by around 6 standard deviations. From the measured coincidence counting rates and the optical system losses, an entangled photon pair production rate of 8.9 × 10(4) s(-1) mW(-1) pump was estimated.
本文介绍了一种基于腔增强参量下转换过程的新型电信波段简并偏振纠缠光子对源的设计与实现。产生了四个最大纠缠贝尔态中的两个；通过在装置中添加一个半波片可获得其余两个。该装置输出端两个探测器之间在A/D基下的符合光子探测率表明产生了高度纠缠态，量子干涉可见度分别为0.971±0.041（ϕ = 0态）和0.932±0.036（ϕ = π态）。发现纠缠态违反了克劳泽 - 霍恩 - 希莫尼 - 霍尔特（CHSH）贝尔不等式约6个标准差。根据测量的符合计数率和光学系统损耗，估计纠缠光子对产生率为8.9×10(4) s(-1) mW(-1)泵浦。
