{"paper":{"title":"Ultrabright narrow-band telecom two-photon source for long-distance quantum communication","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Hideo Kosaka, Kazuya Niizeki, Kohei Ikeda, Kotaro Okamura, Mingyang Zheng, Naoto Namekata, Nobuyuki Takei, Shuichiro Inoue, Tomoyuki Horikiri, Xiuping Xie","submitted_at":"2018-03-21T05:20:16Z","abstract_excerpt":"We demonstrate an ultrabright narrow-band two-photon source at the 1.5 -\\mu m telecom wavelength for long-distance quantum communication. By utilizing a bow-tie cavity, we obtain a cavity enhancement factor of $4.06\\times 10^4$. Our measurement of the second-order correlation function $G^{(2)} ({\\tau})$ reveals that the linewidth of $2.4$ MHz has been hitherto unachieved in the 1.5 -\\mu m telecom band. This two-photon source is useful for obtaining a high absorption probability close to unity by quantum memories set inside quantum repeater nodes. Furthermore, to the best of our knowledge, the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.07749","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}