Dong-Sheng Ding, Zhi-Yuan Zhou, Bao-Sen Shi, Guang-Can Guo
In this work, we report on the first experimental realization of storing a true single photon carrying an orbital angular momentum in a cold atomic ensemble. We prepare a non-classical photon pair via spontaneous four-wave-mixing in a cold atomic ensemble. One photon of each pair is used as a trigger and the other is stored in the experiment. After transmitting through a spiral phase plate, the photon to be stored carries a spatial structure. It is input to the second atomic ensemble and is stored there via electromagnetically induced transparency and retrieved later after a given storage time. We experimentally prove that the non-classical correlation between the trigger photon and the retrieved photon is still kept, the structures of the input and the retrieved photons show very good similarity. The demonstrated capability of storing a spatial structure at single-photon-level opens the possibility to the realization of a high-dimensional quantum memory.
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http://arxiv.org/abs/1305.2675
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