Pang Xiao-Ling, Yang Ai-Lin, Dou Jian-Peng, Li Hang, Zhang Chao-Ni, Poem Eilon, Saunders Dylan J, Tang Hao, Nunn Joshua, Walmsley Ian A, Jin Xian-Min
Center for Integrated Quantum Information Technologies (IQIT), School of Physics and Astronomy and State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China.
CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
Sci Adv. 2020 Feb 7;6(6):eaax1425. doi: 10.1126/sciadv.aax1425. eCollection 2020 Feb.
Quantum memory capable of storage and retrieval of flying photons on demand is crucial for developing quantum information technologies. However, the devices needed for long-distance links are different from those envisioned for local processing. We present the first hybrid quantum memory-enabled network by demonstrating the interconnection and simultaneous operation of two types of quantum memory: an atomic ensemble-based memory and an all-optical Loop memory. Interfacing the quantum memories at room temperature, we observe a well-preserved quantum correlation and a violation of Cauchy-Schwarz inequality. Furthermore, we demonstrate the creation and storage of a fully-operable heralded photon chain state that can achieve memory-built-in combining, swapping, splitting, tuning, and chopping single photons in a chain temporally. Such a quantum network allows atomic excitations to be generated, stored, and converted to broadband photons, which are then transferred to the next node, stored, and faithfully retrieved, all at high speed and in a programmable fashion.
能够按需存储和检索飞行光子的量子存储器对于发展量子信息技术至关重要。然而，长距离链路所需的设备与用于本地处理的设想设备不同。我们通过展示两种类型的量子存储器的互连和同步操作，呈现了首个启用混合量子存储器的网络：基于原子系综的存储器和全光环路存储器。在室温下连接量子存储器，我们观察到量子相关性得到了很好的保留，并且违反了柯西 - 施瓦茨不等式。此外，我们展示了完全可操作的 heralded 光子链态的创建和存储，该态可以在时间上实现内置存储器的单光子在链中的组合、交换、分裂、调谐和斩波。这样的量子网络允许产生、存储原子激发并将其转换为宽带光子，然后将这些光子传输到下一个节点，进行存储并以高速和可编程的方式忠实地检索。
