Abstract
AbstractThis thesis is a summary of my research work during the last few years of my Ph.D. The main system of research is quantum memory based on cold atomic ensembles. Flying photons can be used to transmit quantum information over long distances, and quantum memories based on cold atomic ensembles can act as carriers for local storage and manipulation of quantum information, so it is of great significance to study cold atomic quantum memories for construction of global quantum networks. In this thesis, based on previous work, we further scrutinize the factors that will affect the performance metrics of quantum memory such as retrieval efficiency, and then we combine these analysis with some innovative experimental techniques, which will enable us to finally realize a highly retrievable quantum memory with intrinsic retrieval efficiency up to 90% and overall measured retrieval efficiency up to 40%. Based on this efficient quantum memory, we optimize the experimental loading time for preparing cold atomic ensembles, the number of experimental trials in each loading and other timing parameters, so that the experimental detection brightness of photons can support our experimental study of multiple quantum memories.
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