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 0.55μs (11 cavity round trips), with 11.3±0.1% total memory efficiency, and a signal-to-noise ratio of 12.8 after 1 round trip. In a second, monolithic cavity, we increase this lifetime to 1.75μs (35 round trips) with a memory efficiency of 12.7±0.2 (SNR of 7.0±0.2) after 1 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.
@article{arxiv.2303.12794,
title = {A fiber-integrated quantum memory for telecom light},
author = {K. A. G. Bonsma-Fisher and C. Hnatovsky and D. Grobnic and S. J. Mihailov and P. J. Bustard and D. G. England and B. J. Sussman},
journal= {arXiv preprint arXiv:2303.12794},
year = {2023}
}