Tang Jian-Shun, Zhou Zong-Quan, Wang Yi-Tao, Li Yu-Long, Liu Xiao, Hua Yi-Lin, Zou Yang, Wang Shuang, He De-Yong, Chen Geng, Sun Yong-Nan, Yu Ying, Li Mi-Feng, Zha Guo-Wei, Ni Hai-Qiao, Niu Zhi-Chuan, Li Chuan-Feng, Guo Guang-Can
Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei, Anhui 230026, China.
Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
Nat Commun. 2015 Oct 15;6:8652. doi: 10.1038/ncomms9652.
Quantum repeaters are critical components for distributing entanglement over long distances in presence of unavoidable optical losses during transmission. Stimulated by the Duan-Lukin-Cirac-Zoller protocol, many improved quantum repeater protocols based on quantum memories have been proposed, which commonly focus on the entanglement-distribution rate. Among these protocols, the elimination of multiple photons (or multiple photon-pairs) and the use of multimode quantum memory are demonstrated to have the ability to greatly improve the entanglement-distribution rate. Here, we demonstrate the storage of deterministic single photons emitted from a quantum dot in a polarization-maintaining solid-state quantum memory; in addition, multi-temporal-mode memory with 1, 20 and 100 narrow single-photon pulses is also demonstrated. Multi-photons are eliminated, and only one photon at most is contained in each pulse. Moreover, the solid-state properties of both sub-systems make this configuration more stable and easier to be scalable. Our work will be helpful in the construction of efficient quantum repeaters based on all-solid-state devices.
量子中继器是在传输过程中存在不可避免的光学损耗时用于长距离分发纠缠的关键组件。受段-卢金-西拉克-佐勒协议的启发，人们提出了许多基于量子存储器的改进型量子中继器协议，这些协议通常关注纠缠分发速率。在这些协议中，消除多光子（或多光子对）以及使用多模量子存储器被证明有能力极大地提高纠缠分发速率。在此，我们展示了将量子点发射的确定性单光子存储在保偏固态量子存储器中；此外，还展示了具有1、20和100个窄单光子脉冲的多时间模式存储器。多光子被消除，每个脉冲中最多只包含一个光子。而且，两个子系统的固态特性使这种配置更加稳定且更易于扩展。我们的工作将有助于构建基于全固态器件的高效量子中继器。
