The School of Physics and Electronic Engineering of SCNU has made important progress in quantum storage research: single-photon quantum storage with the highest efficiency in the world has been realized. This feat was published online on March 4, in the online magazine Nature Photonics under the title “Efficient quantum memory for single-photon polarization qubits”.

Quantum storage is a key technology in the field of quantum science and technology. It has important application value in quantum computing, quantum networks, quantum communication etc. and it is also one of the focuses areas in the field of international quantum information research. Although a lot of research has been done internationally, the efficiency of single photon quantum storage has never exceeded 50%, which cannot meet the minimum threshold requirement of quantum non-cloning limit and unidirectional fault-tolerant quantum computation. Moreover, any improvement of storage efficiency on the basis of 50% will bring exponential performance improvements to the practical application of distributed quantum computing and quantum communication. The quantum physics and quantum control team of SCNU improved the efficiency of single-photon quantum storage to more than 90% by a realizing large optical thickness cold atom ensemble and highly controllable waveform of a publicized single-photon source. At the same time, they ingeniously solved many technical problems such as electronic and optical noise, which laid a solid foundation for the realization of practical quantum storage.

Dr. Wang Yunfei, Dr. Li Jianfeng and Dr. Zhang Shanchao are the co-first authors, Professor Yan Hui and Professor Zhu Shiliang are co-authors of the publication. Other participants in the research are: Dr. Du Shengwang, a professor of Hong Kong University of Science and Technology and a specially appointed professor of SCNU, Young Scholar Dr. Liao Kaiyu, and postgraduates Su Keyu and Zhou Yiru. This research has received financial support from the key R&D program of the Ministry of Science and Technology, the National Natural Science Foundation of China, the Natural Science Foundation of Guangdong Province, and fund for the construction of high-level universities.

Source from the School of Physics and Electronic Engineering

Translated by Li Siqi

Proofread by Edwin Pieter Baak 

Edited by Li Jianru

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