{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2013:LHHTEAO5OCY6Z5FLBY63UPOF2I","short_pith_number":"pith:LHHTEAO5","schema_version":"1.0","canonical_sha256":"59cf3201dd70b1ecf4ab0e3dba3dc5d23bd56bf554b7ff6dfb5a65a46235bb6d","source":{"kind":"arxiv","id":"1311.3462","version":3},"attestation_state":"computed","paper":{"title":"Pulsed Sagnac polarization-entangled photon source with a PPKTP crystal at telecom wavelength","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Hirotaka Terai, Kentaro Wakui, Masahide Sasaki, Mikio Fujiwara, Rui-Bo Jin, Ryosuke Shimizu, Shigehito Miki, Taro Yamashita, Zhen Wang","submitted_at":"2013-11-14T11:35:41Z","abstract_excerpt":"We demonstrate pulsed polarization-entangled photons generated from a periodically poled $\\mathrm{KTiOPO_4}$ (PPKTP) crystal in a Sagnac interferometer configuration at telecom wavelength. Since the group-velocity-matching (GVM) condition is satisfied, the intrinsic spectral purity of the photons is much higher than in the previous scheme at around 800 nm wavelength. The combination of a Sagnac interferometer and the GVM-PPKTP crystal makes our entangled source compact, stable, highly entangled, spectrally pure and ultra-bright. The photons were detected by two superconducting nanowire single "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1311.3462","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-11-14T11:35:41Z","cross_cats_sorted":[],"title_canon_sha256":"2f67b4d6bde27fc3d82165d104093615032d47e54e693df634528ab7e9945941","abstract_canon_sha256":"22bf5ff3bc1208c12b922a624397d2f3453df1ee5e0ff85809f30b742aa24cff"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:46:31.064252Z","signature_b64":"2Z4sgU6OiF6Re3yYGeD6o6Vc1JZB0L2YoRDUGS03rf6Rm6iJvkWMOQnxqyamKf26Iz/hDxAlQhV+Cu3CoH25DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"59cf3201dd70b1ecf4ab0e3dba3dc5d23bd56bf554b7ff6dfb5a65a46235bb6d","last_reissued_at":"2026-05-18T01:46:31.063701Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:46:31.063701Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Pulsed Sagnac polarization-entangled photon source with a PPKTP crystal at telecom wavelength","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Hirotaka Terai, Kentaro Wakui, Masahide Sasaki, Mikio Fujiwara, Rui-Bo Jin, Ryosuke Shimizu, Shigehito Miki, Taro Yamashita, Zhen Wang","submitted_at":"2013-11-14T11:35:41Z","abstract_excerpt":"We demonstrate pulsed polarization-entangled photons generated from a periodically poled $\\mathrm{KTiOPO_4}$ (PPKTP) crystal in a Sagnac interferometer configuration at telecom wavelength. Since the group-velocity-matching (GVM) condition is satisfied, the intrinsic spectral purity of the photons is much higher than in the previous scheme at around 800 nm wavelength. The combination of a Sagnac interferometer and the GVM-PPKTP crystal makes our entangled source compact, stable, highly entangled, spectrally pure and ultra-bright. The photons were detected by two superconducting nanowire single "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.3462","kind":"arxiv","version":3},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1311.3462","created_at":"2026-05-18T01:46:31.063788+00:00"},{"alias_kind":"arxiv_version","alias_value":"1311.3462v3","created_at":"2026-05-18T01:46:31.063788+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.3462","created_at":"2026-05-18T01:46:31.063788+00:00"},{"alias_kind":"pith_short_12","alias_value":"LHHTEAO5OCY6","created_at":"2026-05-18T12:27:51.066281+00:00"},{"alias_kind":"pith_short_16","alias_value":"LHHTEAO5OCY6Z5FL","created_at":"2026-05-18T12:27:51.066281+00:00"},{"alias_kind":"pith_short_8","alias_value":"LHHTEAO5","created_at":"2026-05-18T12:27:51.066281+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/LHHTEAO5OCY6Z5FLBY63UPOF2I","json":"https://pith.science/pith/LHHTEAO5OCY6Z5FLBY63UPOF2I.json","graph_json":"https://pith.science/api/pith-number/LHHTEAO5OCY6Z5FLBY63UPOF2I/graph.json","events_json":"https://pith.science/api/pith-number/LHHTEAO5OCY6Z5FLBY63UPOF2I/events.json","paper":"https://pith.science/paper/LHHTEAO5"},"agent_actions":{"view_html":"https://pith.science/pith/LHHTEAO5OCY6Z5FLBY63UPOF2I","download_json":"https://pith.science/pith/LHHTEAO5OCY6Z5FLBY63UPOF2I.json","view_paper":"https://pith.science/paper/LHHTEAO5","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1311.3462&json=true","fetch_graph":"https://pith.science/api/pith-number/LHHTEAO5OCY6Z5FLBY63UPOF2I/graph.json","fetch_events":"https://pith.science/api/pith-number/LHHTEAO5OCY6Z5FLBY63UPOF2I/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/LHHTEAO5OCY6Z5FLBY63UPOF2I/action/timestamp_anchor","attest_storage":"https://pith.science/pith/LHHTEAO5OCY6Z5FLBY63UPOF2I/action/storage_attestation","attest_author":"https://pith.science/pith/LHHTEAO5OCY6Z5FLBY63UPOF2I/action/author_attestation","sign_citation":"https://pith.science/pith/LHHTEAO5OCY6Z5FLBY63UPOF2I/action/citation_signature","submit_replication":"https://pith.science/pith/LHHTEAO5OCY6Z5FLBY63UPOF2I/action/replication_record"}},"created_at":"2026-05-18T01:46:31.063788+00:00","updated_at":"2026-05-18T01:46:31.063788+00:00"}