Quantum Information Center of Tsinghua University, Duan Luming Research Group made significant progress in the field of quantum information, for the first time to achieve an atomic quantum memory with 225 memory cells, the international record of quantum memory storage capacity increased by more than one order of magnitude. The research paper entitled "Experimental realization of a multiplexed quantum memory with 225 individually accessible memory cells", published in this issue, was published recently in Nature Communications. Quantum memory two-dimensional storage array diagram Quantum memory is an important part of realizing long-range quantum communication and quantum computer. Long-range quantum communication requires quantum repeaters to overcome the exponential decay of single-photon signals in transmission channels. In 2001, Duan Lu-Ming and his collaborators proposed the DLCZ (Nature-414, 2001) scheme, which uses a combination of atomic quantum memory and a single-photon channel to suppress attenuation. The program has aroused great repercussions in the field of quantum information. A number of research groups in the United States, China and Europe are committed to implementing the program in the laboratory and made a series of important progress. Review of Modern Physics and Nature have published papers that describe the progress that has been made to improve the storage capacity of quantum memories as a key issue in the experimental implementation of quantum repeaters. Atomic Quantum Memory Array Experimental Device Schematic Earlier, the United States has adopted a space division method, the realization of the 12 memory cells of the quantum memory. The domestic research group makes use of the method of high dimensional state space to realize the quantum storage of 3-7 dimensional optical signal, which can encode 2-3 quantum bits. The method of introducing a two-dimensional quantum memory array (as shown in the following figure) by Duan Luoming's research group has greatly increased the storage capacity of quantum memory and increased the number of atomic memory cells to 225, nearly 20 times higher than the international original records. Experimental Demonstration Quantum Entanglement Storage Between Arbitrary Atomic Storage Cells and Photons This experiment uses the two-dimensional programmable optical path to almost perfectly maintain the coherence between more than two hundred laser paths, which provides the conditions for the coherent quantum bit and the storage of quantum entanglement. The DLCZ scheme is used in this experiment to realize the storage and read of quantum entanglement between photon states and any pair of atomic memory cells. It is proved that each quantum memory cell can operate independently and avoid mutual interference. These technologies have laid the foundation for the realization of high-capacity quantum memories and the development of quantum repeaters. Reviewers consider that "achieving 225 cells of quantum memory is an important milestone in the practical development of quantum memories." Pvc Rug Gripper,Anti-Slip Mattress Pad,Anti-Slip Waterproof Floor Mat,Carpet Protection Mat Anyang Qunxiu Plastics co.,ltd , https://www.qunxu.com