Group of Applied Physics, University of Geneva, 20, Rue de l'Ecole de Médecine, CH-1211 Geneva 4, Switzerland.
Phys Rev Lett. 2010 May 7;104(18):180504. doi: 10.1103/PhysRevLett.104.180504. Epub 2010 May 6.
Single-photon entanglement is a simple form of entanglement that exists between two spatial modes sharing a single photon. Despite its elementary form, it provides a resource as useful as polarization-entangled photons and it can be used for quantum teleportation and entanglement swapping operations. Here, we report the first experiment where single-photon entanglement is purified with a simple linear-optics based protocol. In addition to its conceptual interest, this result might find applications in long distance quantum communication based on quantum repeaters.
单光子纠缠是一种存在于共享单个光子的两个空间模式之间的简单纠缠形式。尽管它的形式很简单，但它提供了与偏振纠缠光子一样有用的资源，并且可用于量子隐形传态和纠缠交换操作。在这里，我们报告了首次使用基于简单线性光学的协议来纯化单光子纠缠的实验。除了其概念上的意义之外，这一结果可能在基于量子中继器的长距离量子通信中找到应用。
