{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2004:MZMXK2XPCVGTLRXGXK57C6I2SI","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":"4d263ac18dbb3a826456719d8e305274d10b3f93a433081d27b43905b15c8476","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2004-01-08T06:27:26Z","title_canon_sha256":"9501e75d374dab7cf158d7628a4aa64cea9f6242e5a143ba7bf3f9a1c5702db9"},"schema_version":"1.0","source":{"id":"quant-ph/0401033","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0401033","created_at":"2026-05-18T01:37:58Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0401033v1","created_at":"2026-05-18T01:37:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0401033","created_at":"2026-05-18T01:37:58Z"},{"alias_kind":"pith_short_12","alias_value":"MZMXK2XPCVGT","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"MZMXK2XPCVGTLRXG","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"MZMXK2XP","created_at":"2026-05-18T12:25:52Z"}],"graph_snapshots":[{"event_id":"sha256:0e8918bad6484841ccb63797b4638bbcf48f8e4a53cdc781769978ef9ce7ce3c","target":"graph","created_at":"2026-05-18T01:37:58Z","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":"We report quantum communications channel using photon number correlated twin beams. The twin beams are generated from a nondegenerate optical parametric oscillator, and the photon number difference is used to encode the signal. The bit error rate of our system will be 0.067 by using the twin beams comparing with 0.217 by using the coherent state as the signal carrier.","authors_text":"Katsuyuki Kasai, Kazuhiro Hayasaka, Yun Zhang","cross_cats":[],"headline":"","license":"","primary_cat":"quant-ph","submitted_at":"2004-01-08T06:27:26Z","title":"Quantum channel using photon number correlated twin beams"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0401033","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:f583501f393b36ee9c0f19f2a3e2d8691a8f81553b133d7a99ff1f718244503c","target":"record","created_at":"2026-05-18T01:37:58Z","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":"4d263ac18dbb3a826456719d8e305274d10b3f93a433081d27b43905b15c8476","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2004-01-08T06:27:26Z","title_canon_sha256":"9501e75d374dab7cf158d7628a4aa64cea9f6242e5a143ba7bf3f9a1c5702db9"},"schema_version":"1.0","source":{"id":"quant-ph/0401033","kind":"arxiv","version":1}},"canonical_sha256":"6659756aef154d35c6e6babbf1791a9227763fec69ef18e38e54544bc7451e19","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6659756aef154d35c6e6babbf1791a9227763fec69ef18e38e54544bc7451e19","first_computed_at":"2026-05-18T01:37:58.796256Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:37:58.796256Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3LV1i4uyvBHX5Tt5r10i6Uks9YJeMrSK8T0MU8vAWkS9IIpt4AW3269JO0Sdl2CmkurulGajCUAz5TlFZ3SICQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:37:58.797012Z","signed_message":"canonical_sha256_bytes"},"source_id":"quant-ph/0401033","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f583501f393b36ee9c0f19f2a3e2d8691a8f81553b133d7a99ff1f718244503c","sha256:0e8918bad6484841ccb63797b4638bbcf48f8e4a53cdc781769978ef9ce7ce3c"],"state_sha256":"c7718f23303d1dd34c6f55397d7eb92952e25f74989a77ea02ae6894fbae36a2"}