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Quantum memories promise to enable global quantum repeater networks. Forfield applications, alkali metal vapors constitute an exceptional storageplatform, as neither cryogenics, nor strong magnetic fields are required. Wedemonstrate a technologically simple, in principle satellite-suited quantummemory based on electromagnetically induced transparency on the cesium D1 line,and focus on the trade-off between end-to-end efficiency and signal-to-noiseratio, both being key parameters in applications. For coherent pulsescontaining one photon on average, we achieve storage and retrieval withend-to-end efficiencies of $\eta_{e2e} = 13(2)\%$, which correspond to internalmemory efficiencies of $\eta_{mem} = 33(1)\%$. Simultaneously, we achieve anoise level corresponding to $\mu_1 = 0.07(2)$ signal photons. This noise isdominated by spontaneous Raman scattering, with contributions fromfluorescence. Four wave mixing noise is negligible, allowing for furtherminimization of the total noise level.

Optimization and readout-noise analysis of a warm vapor EIT memory on the Cs D1 line