Integrated spin-wave quantum memory  

作　　者：Tian-Xiang Zhu Ming-Xu Su Chao Liu Yu-Ping Liu Chao-Fan Wang Pei-Xi Liu Yong-Jian Han Zong-Quan Zhou Chuan-Feng Li Guang-Can Guo 

机构地区：[1]CAS Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China [2]CAS Center for Excellence in Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China [3]Hefei National Laboratory,University of Science and Technology of China,Hefei 230088,China

出　　处：《National Science Review》2024年第11期48-54,共7页国家科学评论（英文版）

基　　金：supported by the National Key R&D Program of China(2017YFA0304100);the Innovation Program for Quantum Science and Technology(2021ZD0301200);the National Natural Science Foundation of China(12222411 and 11821404);the Students’Innovation and Entrepreneurship Foundation of the University of Science and Technology of China(CY2022X06);the China Postdoctoral Science Foundation(2023M743400).

摘　　要：Photonic integrated quantum memories are essential for the construction of scalable quantum networks.Spin-wave quantum storage,which can support on-demand retrieval with a long lifetime,is indispensable for practical applications,but has never been demonstrated in an integrated solid-state device.Here,we demonstrate spin-wave quantum storage based on a laser-written waveguide fabricated in a^(151)Eu^(3+):Y_(2)SiO_(5)crystal,using both the atomic frequency comb and noiseless photon-echo protocols.Qubits encoded with single-photon-level inputs are stored and retrieved with a fidelity of 94.9%±1.2%,which is far beyond the maximal fidelity that can be obtained with any classical device.Our results underline the potential of laser-written integrated devices for practical applications in large-scale quantum networks,such as the construction of multiplexed quantum repeaters in an integrated configuration and high-density transportable quantum memories.

关 键 词：quantum memory integrated optics quantum network quantum optics 

分 类 号：R338.6[医药卫生—人体生理学]