Liu Qian, Song Guo-Zhu, Qiu Tian-Hui, Zhang Xiao-Min, Ma Hong-Yang, Zhang Mei
Research Center for Quantum Optics and Quantum Communication, School of Science, Qingdao University of Technology, Qingdao, 266525, China.
College of Physics and Materials Science, Tianjin Normal University, Tianjin, 300387, China.
Sci Rep. 2020 Dec 8;10(1):21444. doi: 10.1038/s41598-020-78529-2.
We present an efficient hyperentanglement concentration protocol (hyper-ECP) for two-photon six-qubit systems in nonlocal partially hyperentangled Bell states with unknown parameters. In our scheme, we use two identical partially hyperentangled states which are simultaneously entangled in polarization and two different longitudinal momentum degrees of freedom (DOFs) to distill the maximally hyperentangled Bell state. The quantum nondemolition detectors based on the cross-Kerr nonlinearity are used to realize the parity checks of two-photon systems in three DOFs. The hyper-ECP can extract all the useful entanglement source, and the success probability can reach the theory limit with the help of iteration. All these advantages make our hyper-ECP useful in long-distance quantum communication in the future.
我们提出了一种针对具有未知参数的非局域部分超纠缠贝尔态中的双光子六量子比特系统的高效超纠缠浓缩协议（hyper-ECP）。在我们的方案中，我们使用两个同时在偏振和两个不同的纵向动量自由度（DOF）上纠缠的相同部分超纠缠态来提纯最大超纠缠贝尔态。基于交叉克尔非线性的量子非破坏探测器用于实现三自由度中双光子系统的奇偶校验。该超纠缠浓缩协议可以提取所有有用的纠缠源，并且借助迭代成功概率可以达到理论极限。所有这些优点使得我们的超纠缠浓缩协议在未来的长距离量子通信中很有用。
