Heralded generation of entangled photon pairs
Heralded generation of entangled photon pairs
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DOI：
10.1038/nphoton.2010.156
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发表时间：
2010-08-01
期刊：
影响因子：
35
通讯作者：
Walther, Philip
中科院分区：
文献类型：
--
作者：
Barz, Stefanie;Cronenberg, Gunther;Walther, Philip
纠缠光子是量子通信和线性光量子计算的重要资源。不幸的是，由于光子源的随机性，许多基于光子的方案的适用性受到限制。因此，全世界都在努力克服概率发射的限制，通过产生以检测辅助光子为条件的双光子纠缠态。在这里，我们通过线性光学和自发参数下转换的标准光子检测，提出了第一代在偏振中最大程度纠缠的光子态(1)。我们使用了对应于三个光子对产生的下转换状态，其中四个辅助光子的同时检测明确预示着纠缠态的成功制备(2)。这种受控的纠缠光子态的产生是线性光学量子网络适用性的重要一步，特别是对于纠缠交换，量子隐形传态，量子密码学和基于光子的量子计算的可扩展方法(3)。
Entangled photons are a crucial resource for quantum communication and linear optical quantum computation. Unfortunately, the applicability of many photon-based schemes is limited due to the stochastic character of the photon sources. Therefore, a worldwide effort has focused on overcoming the limitation of probabilistic emission by generating two-photon entangled states conditioned on the detection of auxiliary photons. Here we present the first heralded generation of photon states that are maximally entangled in polarization with linear optics and standard photon detection from spontaneous parametric down-conversion(1). We use the downconversion state corresponding to the generation of three photon pairs, where the coincident detection of four auxiliary photons unambiguously heralds the successful preparation of the entangled state(2). This controlled generation of entangled photon states is a significant step towards the applicability of a linear optics quantum network, in particular for entanglement swapping, quantum teleportation, quantum cryptography and scalable approaches towards photonics-based quantum computing(3).