Characterizing an entangled-photon source with classical detectors and measurements
Characterizing an entangled-photon source with classical detectors and measurements
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DOI：
10.1364/optica.2.000430
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发表时间：
2015-05-20
期刊：
影响因子：
10.4
通讯作者：
Liscidini, Marco
中科院分区：
文献类型：
--
作者：
Rozema, Lee A.;Wang, Chao;Liscidini, Marco
纠缠光子对在量子计算和通信中有着重要的应用，量子态层析成像（QST）是表征纠缠光子源的通用工具。在QST中，非常低的功率信号必须用单光子探测器和符合逻辑来测量。在这里，我们实验性地实现了一个新的协议，“受激发射断层扫描”（SET），使我们能够获得由QST提供的信息时，光子对产生的参数荧光。这种方法利用了一个刺激的过程，结果在一个信号的几个数量级大于QST。特别是，我们的特点是光子的偏振态，将产生自发参量下转换使用SET。我们发现，SET准确地预测了自发产生光子的纯度和并发与QST的结果一致。我们预计，SET将是非常有用的参数荧光的基础上，纠缠源的特征，提供一个快速，有效的技术，可能取代或补充QST。(C)2015美国光学学会
Entangled-photon pairs are essential for many applications in quantum computation and communication, and quantum state tomography (QST) is the universal tool to characterize such entangled-photon sources. In QST, very low-power signals must be measured with single-photon detectors and coincidence logic. Here, we experimentally implement a new protocol, "stimulated-emission tomography" (SET), allowing us to obtain the information provided by QST when the photon pairs are generated by parametric fluorescence. This approach exploits a stimulated process that results in a signal several orders of magnitude larger than in QST. In particular, we characterize the polarization state of photons that would be generated in spontaneous parametric downconversion using SET. We find that SET accurately predicts the purity and concurrence of the spontaneously generated photons in agreement with the results of QST. We expect that SET will be extremely useful to characterize entanglement sources based on parametric fluorescence, providing a fast and efficient technique to potentially replace or supplement QST. (C) 2015 Optical Society of America