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High efficiency quantum storage of single photons in cold atoms

Jian‐Feng Li, Yunfei Wang, Shanchao Zhang, J. He, Aiqin Cheng, Hui Yan, Shi-Liang Zhu

Published Jun 5, 2017• 1 citation
OpenAlex

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We interface a spontaneous parametric down conversion (SPDC) crystal and a cold atomic ensemble and demonstrate a highly efficient quantum memory through polarization-encoded single-photon qubits. Specifically, narrowband heralded single photons from a cavity-enhanced SPDC source is stored using cold atomic ensemble, with ~70% storage-and-retrieval efficiency and ~10μμμs storage time at 50% efficiency. To prevent the degradation after storage, we also manipulate the single-photon wave profile so that the retrieved non-classical nature of single photon is preserved. On the other hand, the dual-rail storage is used for storing polarization-encoded qubits, and the corrected fidelity of flying qubits after storage reaches ~97%. The results pave the way toward large-scale quantum network.