Ren Bao-Cang, Long Gui Lu
Opt Express. 2014 Mar 24;22(6):6547-61. doi: 10.1364/OE.22.006547.
Hyperentanglement is a promising resource in quantum information processing, especially for increasing the channel capacity of long-distance quantum communication. Here we present a general hyper-entanglement concentration protocol (hyper-ECP) for nonlocal partially hyperentangled Bell states that decay with the interrelationship between the polarization and the spatial-mode degrees of freedom of two-photon systems, which is not taken into account in other hyper-ECPs, resorting to the optical property of the quantum-dot spins inside one-side optical microcavities. We show that the success probability of our hyper-ECP is largely increased by iteration of the hyper-ECP process. Our hyper-ECP can be straightforwardly generalized to distill nonlocal maximally hyperentangled N-photon Greenberger-Horne-Zeilinger (GHZ) states from arbitrary partially hyperentangled GHZ-class states.
超纠缠是量子信息处理中一种很有前景的资源，特别是对于增加长距离量子通信的信道容量而言。在此，我们提出了一种通用的超纠缠浓缩协议（hyper-ECP），用于非局域部分超纠缠贝尔态，这些贝尔态会随着双光子系统的偏振和空间模式自由度之间的相互关系而衰减，而其他超纠缠浓缩协议并未考虑这种相互关系，我们借助单侧光学微腔内量子点自旋的光学特性来实现。我们表明，通过超纠缠浓缩协议过程的迭代，我们的超纠缠浓缩协议的成功概率大幅提高。我们的超纠缠浓缩协议可以直接推广，以从任意部分超纠缠的格林伯格-霍恩-泽林格（GHZ）类态中提取非局域最大超纠缠N光子GHZ态。
