论文标题
在CS D1线上的热蒸气EIT内存的优化和读取分析
Optimization and readout-noise analysis of a warm vapor EIT memory on the Cs D1 line
论文作者
论文摘要
量子记忆有望实现全球量子中继器网络。对于现场应用，碱金属蒸气构成了一个非凡的存储平台，因为既不需要低温，也不需要强磁场。我们证明了一种基于卫星的技术简单，原则上的量子记忆，基于电磁诱导的剖宫产D1线上的透明度，并集中在端到端效率和信号到噪声比率之间的权衡，这都是应用中的关键参数。对于平均包含一个光子的相干脉冲，我们以$η_{e2e} = 13（2）\％$的端到端效率实现存储和检索，这对应于$η_{mem} = 33（1）\％$ $的内部存储效率。同时，我们达到的噪声水平对应于$μ_1= 0.07（2）$信号光子。这种噪声以自发的拉曼散射为主，并具有荧光的贡献。四波混合噪声可以忽略不计，可以进一步最小化总噪声水平。
Quantum memories promise to enable global quantum repeater networks. For field applications, alkali metal vapors constitute an exceptional storage platform, as neither cryogenics, nor strong magnetic fields are required. We demonstrate a technologically simple, in principle satellite-suited quantum memory based on electromagnetically induced transparency on the cesium D1 line, and focus on the trade-off between end-to-end efficiency and signal-to-noise ratio, both being key parameters in applications. For coherent pulses containing one photon on average, we achieve storage and retrieval with end-to-end efficiencies of $η_{e2e} = 13(2)\%$, which correspond to internal memory efficiencies of $η_{mem} = 33(1)\%$. Simultaneously, we achieve a noise level corresponding to $μ_1 = 0.07(2)$ signal photons. This noise is dominated by spontaneous Raman scattering, with contributions from fluorescence. Four wave mixing noise is negligible, allowing for further minimization of the total noise level.
