{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:DWS6DTVRDEOZJR7V5NIBAPO5KR","short_pith_number":"pith:DWS6DTVR","canonical_record":{"source":{"id":"0912.1493","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-12-08T13:28:47Z","cross_cats_sorted":[],"title_canon_sha256":"f61c8cefe107b51adcc2191decd7220973c433ea926e3c27ba39e3b4c6c32285","abstract_canon_sha256":"41785eea10afd0499af049f4c6796924d85ed4bbf100f721a52281c3b1ed956c"},"schema_version":"1.0"},"canonical_sha256":"1da5e1ceb1191d94c7f5eb50103ddd547d95021808f5dad2c0c0ec439055103f","source":{"kind":"arxiv","id":"0912.1493","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0912.1493","created_at":"2026-05-18T02:10:25Z"},{"alias_kind":"arxiv_version","alias_value":"0912.1493v1","created_at":"2026-05-18T02:10:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0912.1493","created_at":"2026-05-18T02:10:25Z"},{"alias_kind":"pith_short_12","alias_value":"DWS6DTVRDEOZ","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"DWS6DTVRDEOZJR7V","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"DWS6DTVR","created_at":"2026-05-18T12:25:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:DWS6DTVRDEOZJR7V5NIBAPO5KR","target":"record","payload":{"canonical_record":{"source":{"id":"0912.1493","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-12-08T13:28:47Z","cross_cats_sorted":[],"title_canon_sha256":"f61c8cefe107b51adcc2191decd7220973c433ea926e3c27ba39e3b4c6c32285","abstract_canon_sha256":"41785eea10afd0499af049f4c6796924d85ed4bbf100f721a52281c3b1ed956c"},"schema_version":"1.0"},"canonical_sha256":"1da5e1ceb1191d94c7f5eb50103ddd547d95021808f5dad2c0c0ec439055103f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:10:25.707336Z","signature_b64":"uRsNpSBND6LWBE/xrzMPye4OatfGMs83oSq16Uvpbmx6LmwS1CVWROYMXclwbjnr6R46PWvyZYz+rZgvvkplCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1da5e1ceb1191d94c7f5eb50103ddd547d95021808f5dad2c0c0ec439055103f","last_reissued_at":"2026-05-18T02:10:25.706709Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:10:25.706709Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0912.1493","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:10:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IuSy7MV+ePTDzKnGTxaxau7KkDbYkGkp+dqEeoR1AsvNWDw4yTG6bMFitSXOLoTk1Hb5ukk52CGQTaoJOb1nDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T22:29:39.037880Z"},"content_sha256":"0e6f3d79aaa0ad683a4f364d8e8128fbbd28b929529e62b024c04599e0fd09d5","schema_version":"1.0","event_id":"sha256:0e6f3d79aaa0ad683a4f364d8e8128fbbd28b929529e62b024c04599e0fd09d5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:DWS6DTVRDEOZJR7V5NIBAPO5KR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Improving noise threshold for optical quantum computing with the EPR photon source","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"C. H. Oh, L.-M. Duan, Y.-J. Han, Z.-H. Wei","submitted_at":"2009-12-08T13:28:47Z","abstract_excerpt":"We show that the noise threshold for optical quantum computing can be significantly improved by using the EPR-type of photon source. In this implementation, the detector efficiency $\\eta_{d}$ is required to be larger than 50%, and the source efficiency $\\eta_{s}$ can be an arbitrarily small positive number. This threshold compares favorably with the implementation using the single-photon source, where one requires the combined efficiency $\\eta_{d}\\eta_{s}>2/3$. We discuss several physical setups for realization of the required EPR photon source, including the photon emitter from a single-atom "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0912.1493","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:10:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1q8IdqrUEUIMrRuu5sYleshmRlI1iyGEua0cZ1nut01+o6yT4KYjj1bilJvPVaVBQi6dbbT8XjmYA/PiCFvQDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T22:29:39.038526Z"},"content_sha256":"0d7424a09042931ce5a235ed9a521e17f7390e227ec6d982f9d861bce3120000","schema_version":"1.0","event_id":"sha256:0d7424a09042931ce5a235ed9a521e17f7390e227ec6d982f9d861bce3120000"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DWS6DTVRDEOZJR7V5NIBAPO5KR/bundle.json","state_url":"https://pith.science/pith/DWS6DTVRDEOZJR7V5NIBAPO5KR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DWS6DTVRDEOZJR7V5NIBAPO5KR/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-28T22:29:39Z","links":{"resolver":"https://pith.science/pith/DWS6DTVRDEOZJR7V5NIBAPO5KR","bundle":"https://pith.science/pith/DWS6DTVRDEOZJR7V5NIBAPO5KR/bundle.json","state":"https://pith.science/pith/DWS6DTVRDEOZJR7V5NIBAPO5KR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DWS6DTVRDEOZJR7V5NIBAPO5KR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:DWS6DTVRDEOZJR7V5NIBAPO5KR","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":"41785eea10afd0499af049f4c6796924d85ed4bbf100f721a52281c3b1ed956c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-12-08T13:28:47Z","title_canon_sha256":"f61c8cefe107b51adcc2191decd7220973c433ea926e3c27ba39e3b4c6c32285"},"schema_version":"1.0","source":{"id":"0912.1493","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0912.1493","created_at":"2026-05-18T02:10:25Z"},{"alias_kind":"arxiv_version","alias_value":"0912.1493v1","created_at":"2026-05-18T02:10:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0912.1493","created_at":"2026-05-18T02:10:25Z"},{"alias_kind":"pith_short_12","alias_value":"DWS6DTVRDEOZ","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"DWS6DTVRDEOZJR7V","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"DWS6DTVR","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:0d7424a09042931ce5a235ed9a521e17f7390e227ec6d982f9d861bce3120000","target":"graph","created_at":"2026-05-18T02:10:25Z","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 show that the noise threshold for optical quantum computing can be significantly improved by using the EPR-type of photon source. In this implementation, the detector efficiency $\\eta_{d}$ is required to be larger than 50%, and the source efficiency $\\eta_{s}$ can be an arbitrarily small positive number. This threshold compares favorably with the implementation using the single-photon source, where one requires the combined efficiency $\\eta_{d}\\eta_{s}>2/3$. We discuss several physical setups for realization of the required EPR photon source, including the photon emitter from a single-atom ","authors_text":"C. H. Oh, L.-M. Duan, Y.-J. Han, Z.-H. Wei","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-12-08T13:28:47Z","title":"Improving noise threshold for optical quantum computing with the EPR photon source"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0912.1493","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":"sha256:0e6f3d79aaa0ad683a4f364d8e8128fbbd28b929529e62b024c04599e0fd09d5","target":"record","created_at":"2026-05-18T02:10:25Z","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":"41785eea10afd0499af049f4c6796924d85ed4bbf100f721a52281c3b1ed956c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2009-12-08T13:28:47Z","title_canon_sha256":"f61c8cefe107b51adcc2191decd7220973c433ea926e3c27ba39e3b4c6c32285"},"schema_version":"1.0","source":{"id":"0912.1493","kind":"arxiv","version":1}},"canonical_sha256":"1da5e1ceb1191d94c7f5eb50103ddd547d95021808f5dad2c0c0ec439055103f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1da5e1ceb1191d94c7f5eb50103ddd547d95021808f5dad2c0c0ec439055103f","first_computed_at":"2026-05-18T02:10:25.706709Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:10:25.706709Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"uRsNpSBND6LWBE/xrzMPye4OatfGMs83oSq16Uvpbmx6LmwS1CVWROYMXclwbjnr6R46PWvyZYz+rZgvvkplCw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:10:25.707336Z","signed_message":"canonical_sha256_bytes"},"source_id":"0912.1493","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0e6f3d79aaa0ad683a4f364d8e8128fbbd28b929529e62b024c04599e0fd09d5","sha256:0d7424a09042931ce5a235ed9a521e17f7390e227ec6d982f9d861bce3120000"],"state_sha256":"14f75327bd502d912e155b8d5d0d582e4ab9fe573b7f76388381040fc8329f86"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JRiryBgAhNDSwHwYIzW0bzs8utiOcq0w+Ow/0x9GHOlNbMiwttt5Wh6YKw41lj2q2xNNYRdbSMqnNVvIIaWiCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T22:29:39.041619Z","bundle_sha256":"c0be55ac44ae4f3c31a6af1f38684ffb9075258a06ba1dd704ce1f8214d61932"}}