{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:7K4COZ334YNCBF7HFSLNCWW2Z3","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"1a21bdf89392049151a2f9a72b716ccf3e5c2866c3b041ca4c267b7611d0d661","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-09-10T11:18:17Z","title_canon_sha256":"884419c651292fdf635815d1e6c1290a40977f4401f00748c6449b0adab4edb4"},"schema_version":"1.0","source":{"id":"1409.3025","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1409.3025","created_at":"2026-05-18T02:30:33Z"},{"alias_kind":"arxiv_version","alias_value":"1409.3025v1","created_at":"2026-05-18T02:30:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1409.3025","created_at":"2026-05-18T02:30:33Z"},{"alias_kind":"pith_short_12","alias_value":"7K4COZ334YNC","created_at":"2026-05-18T12:28:19Z"},{"alias_kind":"pith_short_16","alias_value":"7K4COZ334YNCBF7H","created_at":"2026-05-18T12:28:19Z"},{"alias_kind":"pith_short_8","alias_value":"7K4COZ33","created_at":"2026-05-18T12:28:19Z"}],"graph_snapshots":[{"event_id":"sha256:9ffaaed862a855739de3b6cf56e94f2c429f3456793a30dd695c64d9b22ef809","target":"graph","created_at":"2026-05-18T02:30:33Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Efficient generation and detection of indistinguishable twin photons are at the core of quantum information and communications technology (Q-ICT). These photons are conventionally generated by spontaneous parametric down conversion (SPDC), which is a probabilistic process, and hence occurs at a limited rate, which restricts wider applications of Q-ICT. To increase the rate, one had to excite SPDC by higher pump power, while it inevitably produced more unwanted multi-photon components, harmfully degrading quantum interference visibility.Here we solve this problem by using recently developed 10 ","authors_text":"Hirotaka Terai, Isao Morohashi, Kentaro Wakui, Masahide Sasaki, Masahiro Takeoka, Mikio Fujiwara, Rui-Bo Jin, Ryosuke Shimizu, Shigehito Miki, Shuro Izumi, Takahide Sakamoto, Taro Yamashita, Zhen Wang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-09-10T11:18:17Z","title":"Efficient generation of twin photons at telecom wavelengths with 10 GHz repetition-rate tunable comb laser"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.3025","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:1b5f298edfd52bbe609b0c40cc611ae793f20c1929b965a4af9dbdf100427363","target":"record","created_at":"2026-05-18T02:30:33Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"1a21bdf89392049151a2f9a72b716ccf3e5c2866c3b041ca4c267b7611d0d661","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2014-09-10T11:18:17Z","title_canon_sha256":"884419c651292fdf635815d1e6c1290a40977f4401f00748c6449b0adab4edb4"},"schema_version":"1.0","source":{"id":"1409.3025","kind":"arxiv","version":1}},"canonical_sha256":"fab827677be61a2097e72c96d15adacef80801aea0f7015caf7fda1a22765ce8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fab827677be61a2097e72c96d15adacef80801aea0f7015caf7fda1a22765ce8","first_computed_at":"2026-05-18T02:30:33.705353Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:30:33.705353Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"iLArmBcy02+sFMeg6MzrUyLIwXa3YSDCBA6c7ea5yMk7cHufAgMFuKhdkTjLeZgkJG937H/bzavuX/vF8ruQCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:30:33.705757Z","signed_message":"canonical_sha256_bytes"},"source_id":"1409.3025","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1b5f298edfd52bbe609b0c40cc611ae793f20c1929b965a4af9dbdf100427363","sha256:9ffaaed862a855739de3b6cf56e94f2c429f3456793a30dd695c64d9b22ef809"],"state_sha256":"56ad89c81554c598dc416afc1f1ea10c924d1726e01a1b23a7513cb01ccc2bed"}