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Rev. Lett."],"accepted":{"date-parts":[[2026,7,23]]},"abstract":"\n Long-lived storage of single photons under the form of atomic excitations is at the foundation of long-distance entanglement distribution in quantum networks. To mitigate decoherence effects induced by the environment, rephasing of the hyperfine coherences using microwave pulses have been implemented in a variety of single-emitter and ensemble-based solid-state systems. However, the demonstration of storage of single photons in an absorptive quantum memory including such a spin-rephasing mechanism remains elusive. In this Letter, we show nonclassical storage of telecom-heralded single photons in a\n \n \n \n \n Pr<\/a:mi>\n <\/a:mrow>\n \n 3<\/a:mn>\n +<\/a:mo>\n <\/a:mrow>\n <\/a:msup>\n :<\/a:mo>\n \n \n Y<\/a:mi>\n <\/a:mrow>\n \n 2<\/a:mn>\n <\/a:mrow>\n <\/a:msub>\n \n \n \n SiO<\/a:mi>\n <\/a:mrow>\n \n 5<\/a:mn>\n <\/a:mrow>\n <\/a:msub>\n <\/a:mrow>\n <\/a:mrow>\n <\/a:math>\n rare-earth ion doped crystal quantum memory using the atomic frequency comb spin-wave protocol combined with a XY4 spin-rephasing sequence. Long-lived atomic frequency comb photon echoes are first observed in the classical regime for storage times of up to approximately 3\u00a0ms. We then demonstrate nonclassical correlations between heralding photons and stored signal photons generated by a cavity-enhanced parametric photon-pair source for storage times of up to\n \n \n 180<\/d:mn>\n \u2009<\/d:mtext>\n \u2009<\/d:mtext>\n \u03bc<\/d:mi>\n s<\/d:mi>\n <\/d:mrow>\n <\/d:math>\n and with measured cross-correlation values as high as 4.6(4). Together with the capacity of\n \n \n \n \n Pr<\/h:mi>\n <\/h:mrow>\n \n 3<\/h:mn>\n +<\/h:mo>\n <\/h:mrow>\n <\/h:msup>\n :<\/h:mo>\n \n \n Y<\/h:mi>\n <\/h:mrow>\n \n 2<\/h:mn>\n <\/h:mrow>\n <\/h:msub>\n \n \n \n SiO<\/h:mi>\n <\/h:mrow>\n \n 5<\/h:mn>\n <\/h:mrow>\n <\/h:msub>\n <\/h:mrow>\n <\/h:mrow>\n <\/h:math>\n quantum memories to support highly efficient and multiplexed storage, this result represents a significant step toward scalable long-distance quantum repeater links.\n <\/jats:p>","DOI":"10.1103\/ftkb-pkvp","type":"journal-article","created":{"date-parts":[[2026,7,23]],"date-time":"2026-07-23T13:37:30Z","timestamp":1784813850000},"update-policy":"https:\/\/doi.org\/10.1103\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["Long-Lived Telecom-Heralded Single-Photon Storage in an Absorptive Spin-Rephased Quantum 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All rights are reserved, including those for text and data mining, AI training, and similar technologies.","name":"copyright_statement","label":"Copyright statement","group":{"name":"copyright","label":"copyright"}},{"value":"2026","name":"copyright_year","label":"Copyright year","group":{"name":"copyright","label":"copyright"}},{"value":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/","name":"creative_commons_license","label":"Creative Commons license","group":{"name":"licenses","label":"Licenses"}},{"value":"\u00a92026 The authors","name":"copyright_holder","label":"Copyright holder","group":{"name":"copyright","label":"copyright"}}],"article-number":"120803"}}