The efficient storage and on-demand retrieval of quantum optical states that are compatible with the telecommunications band is a requirement for future terrestrial-based quantum optical networking. Spectrum in the telecommunications band minimizes optical fiber-propagation losses, and broad optical bandwidth facilitates high-speed networking protocols. Here we report on a telecommunications-wavelength- and bandwidth-compatible quantum memory. Using the Off-Resonant Cascaded Absorption protocol in hot ${}^{87}\mathrm{Rb}$ vapor, we demonstrate a total internal memory efficiency of $20.90(1)\mathrm{\%}$ with a Doppler-limited storage time of $1.10(2)$ ns. We characterize the memory performance with weak coherent states and measure a signal-to-noise ratio of $1.9(1)\times {10}^4$ for an average input photon number of 0.084.

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• Light-matter interaction
• Photonics
• Quantum communication
• Quantum information with atoms & light
• Quantum memories
• Quantum networks
• Alkali metals
• Atomic gases