Hua Yi-Lin, Yang Tian-Shu, Zhou Zong-Quan, Wang Jian, Liu Xiao, Li Zong-Feng, Li Pei-Yun, Ma Yu, Liu Chao, Liang Peng-Jun, Hu Jun, Li Xue, Li Chuan-Feng, Guo Guang-Can
CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China; CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China; CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
Sci Bull (Beijing). 2019 Nov 15;64(21):1577-1583. doi: 10.1016/j.scib.2019.09.006. Epub 2019 Sep 9.
A memory-based quantum repeater architecture provides a solution to distribute quantum information to an arbitrary long distance. Practical quantum repeaters are likely to be built in optical-fiber networks which take advantage of the low-loss transmission between quantum memory nodes. Most quantum memory platforms have characteristic atomic transitions away from the telecommunication band. A nondegenerate photon pair source is therefore useful for connection of a quantum memory to optical fibers. Here, we report a high-brightness narrowband photon-pair source which is compatible with a rare-earth-ion-doped crystal Pr:YSiO. The photon-pair source is generated through a cavity-enhanced spontaneous parametric down-conversion process with the signal photon at 606 nm and the idler photon at 1540 nm. Moreover, using the telecom C-band idler photons for heralding, we demonstrate the reversible transfer of orbital-angular-momentum qubit between the signal photon and the quantum memory based on Pr:YSiO.
基于存储器的量子中继器架构为将量子信息分发到任意长距离提供了一种解决方案。实用的量子中继器很可能构建在光纤网络中，该网络利用量子存储节点之间的低损耗传输。大多数量子存储平台具有远离电信频段的特征原子跃迁。因此，非简并光子对源对于将量子存储器连接到光纤很有用。在此，我们报告了一种与掺稀土离子晶体Pr:YSiO兼容的高亮度窄带光子对源。该光子对源通过腔增强自发参量下转换过程产生，信号光子波长为606nm，闲频光子波长为1540nm。此外，利用电信C波段闲频光子进行预示，我们展示了基于Pr:YSiO的信号光子与量子存储器之间轨道角动量量子比特的可逆转移。
