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arXiv:2303.12794 · Physical Review A

Fiber-integrated quantum memory for telecom light

Kent Bonsma-Fisher, Cyril Hnatovsky, Dan M. Grobnic, Stephen J. Mihailov, Philip J. Bustard, Duncan G. England, Benjamin Sussman

Published Jul 7, 2023• 7 citations
arXivHTMLPDF

Abstract

We demonstrate the storage and on-demand retrieval of single-photon-level telecom pulses in a fiber cavity. The cavity is formed by fiber Bragg gratings at either end of a single-mode fiber. Photons are mapped into and out of the cavity using quantum frequency conversion driven by intense control pulses. In a first spliced-fiber cavity, we demonstrate storage up to $0.55\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{s}$ (11 cavity round trips), with $11.3%\ifmmode\pm\else\textpm\fi{}0.1$% total memory efficiency and a signal-to-noise ratio (SNR) of 12.8 after one round trip. In a second, monolithic cavity, we increase this lifetime to $1.75\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{s}$ (35 round trips) with a memory efficiency of $12.7%\ifmmode\pm\else\textpm\fi{}0.2%$ (SNR of $7.0\ifmmode\pm\else\textpm\fi{}0.2$) after one round trip. Fiber-based cavities for quantum storage at telecom wavelengths offer a promising route to synchronizing spontaneous-photon-generation events and building scalable quantum networks.

DOI
10.1103/physreva.108.012606

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