A Single-Photon-compatible Telecom-C-Band Quantum Memory in a Hot Atomic Gas

• URL: http://arxiv.org/abs/2211.04415v1
• Date: Tue, 8 Nov 2022 18:00:01 GMT
• Title: A Single-Photon-compatible Telecom-C-Band Quantum Memory in a Hot Atomic Gas
• Authors: S. E. Thomas, S. Sagona-Stophel, Z. Schofield, I. A. Walmsley, P. M. Ledingham
• Abstract summary: Storage and on-demand retrieval of quantum optical states compatible with the telecommunications C-band is a requirement for future terrestrial-based quantum optical networking. We report on a telecommunication wavelength and bandwidth compatible quantum memory. We demonstrate a total memory efficiency of $20.90(1),%$ with a Doppler-limited storage time of $1.10(2),$ns.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The efficient storage and on-demand retrieval of quantum optical states that are compatible with the telecommunications C-band is a requirement for future terrestrial-based quantum optical networking. Spectrum in the C-band minimises optical fiber-propagation losses, and broad optical bandwidth facilitates high-speed networking protocols. Here we report on a telecommunication wavelength and bandwidth compatible quantum memory. Using the Off-Resonant Cascaded Absorption protocol in hot $^{87}$Rb vapour, we demonstrate a total memory efficiency of $20.90(1)\,\%$ with a Doppler-limited storage time of $1.10(2)\,$ns. We characterise the memory performance with weak coherent states, demonstrating signal-to-noise ratios greater than unity for mean photon number inputs above $4.5(6)\times10^{-6}$ per pulse.

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