Abstract

AbstractIn quantum networks, the basic building block is to realize quantum connection of separate quantum nodes. If one wants to efficiently realize the connection between quantum memories with cold atomic ensembles, the performance of a single quantum memory is required to be high enough to be able to obtain high-quality photon-atom interface. One of the most important parameters to assess the performance of a quantum memory is retrieval efficiency, which indicates how efficiently the stored quantum information can be retrieved. Therefore, in this chapter, I will mainly introduce the experimental progress of DLCZ quantum memory with cold atomic ensembles, analyze and optimize the retrieval efficiency affected by the atomic optical depth, spin wave motion and other factors, so as to improve the retrieval efficiency of quantum memory.

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