论文标题
由腔体增强自发参数下调产生的预示量子的有效量子记忆
Efficient quantum memory for heralded single photons generated by cavity-enhanced spontaneous parametric downconversion
论文作者
论文摘要
我们将自发的参数降低转化率（SPDC）晶体与冷原子集合接口，并通过偏振编码的单光子量子矩进行了高效的量子记忆。具体而言，使用冷原子合奏存储了来自腔体增强SPDC源的窄带单个光子，其存储效率约为70％，〜10 $μ$ S的存储时间以50％的效率为单位。为了防止存储后的降解，我们还操纵单光子波轮廓，以便保留单光子检索的非经典性质。另一方面，双轨存储用于存储偏振量子箱，并且在存储后校正的飞行量子的固定性达到约97％。结果铺平了通向大规模量子网络的道路。
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 ~10$μ$s 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.
