{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2001:JHCF5DBVIJNB2USYJ5VF34RQ3A","short_pith_number":"pith:JHCF5DBV","canonical_record":{"source":{"id":"quant-ph/0107139","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2001-07-27T14:19:35Z","cross_cats_sorted":[],"title_canon_sha256":"de96fcca6e6af7599788efcbb7bb4eb882a5a54f44cb249eea609377b145958f","abstract_canon_sha256":"217155e02fa95b6466853982449c497c57397bf5a48eaa498a76e62047ef4321"},"schema_version":"1.0"},"canonical_sha256":"49c45e8c35425a1d52584f6a5df230d8180279d29d77a0aa992955f24acd5cfb","source":{"kind":"arxiv","id":"quant-ph/0107139","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0107139","created_at":"2026-05-18T01:05:04Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0107139v1","created_at":"2026-05-18T01:05:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0107139","created_at":"2026-05-18T01:05:04Z"},{"alias_kind":"pith_short_12","alias_value":"JHCF5DBVIJNB","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"JHCF5DBVIJNB2USY","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"JHCF5DBV","created_at":"2026-05-18T12:25:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2001:JHCF5DBVIJNB2USYJ5VF34RQ3A","target":"record","payload":{"canonical_record":{"source":{"id":"quant-ph/0107139","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2001-07-27T14:19:35Z","cross_cats_sorted":[],"title_canon_sha256":"de96fcca6e6af7599788efcbb7bb4eb882a5a54f44cb249eea609377b145958f","abstract_canon_sha256":"217155e02fa95b6466853982449c497c57397bf5a48eaa498a76e62047ef4321"},"schema_version":"1.0"},"canonical_sha256":"49c45e8c35425a1d52584f6a5df230d8180279d29d77a0aa992955f24acd5cfb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:05:04.882135Z","signature_b64":"VrTxnDwyfZjhT9NfiPcbZUuu30pNX9lQAWtovZpsRpwr1cUq+hNsjwE5WAXjY8gn3QKElKkUmzVH3ltfk3Z7AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"49c45e8c35425a1d52584f6a5df230d8180279d29d77a0aa992955f24acd5cfb","last_reissued_at":"2026-05-18T01:05:04.881298Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:05:04.881298Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"quant-ph/0107139","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":"2026-05-18T01:05:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"keUHXMExzfSy6PFasjd8e45p1LXVNAquFhniG8szel2cOX3NsBHNJDvF4LFsRvchHydHzyTgykhgS5OzUzx8CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T02:37:03.116687Z"},"content_sha256":"e640028a547b34b042255e6bed27b923b73c945b8152efa70d5eda77a2a25caf","schema_version":"1.0","event_id":"sha256:e640028a547b34b042255e6bed27b923b73c945b8152efa70d5eda77a2a25caf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2001:JHCF5DBVIJNB2USYJ5VF34RQ3A","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Master Equation for Retrodiction of Quantum Communication Signals","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"David T. Pegg, John Jeffers, Ottavia Jedrkiewicz, Stephen M. Barnett","submitted_at":"2001-07-27T14:19:35Z","abstract_excerpt":"We derive the master equation that governs the evolution of the measured state backwards in time in an open system. This allows us to determine probabilities for a given set of preparation events from the results of subsequent measurements, which has particular relevance to quantum communication."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0107139","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":"2026-05-18T01:05:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fzEz+EJkwaMA6ndq73meQJTneyt7NbM02mSMu7QF/MgQ3C4ageXujFIUYK0Vo/7SFbg2nEqy05QSEWEXvGb7Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T02:37:03.117361Z"},"content_sha256":"9cf5c16c0269a80a8b47afbf07965cb045292038542fcc4adb5b8ea0220e1dbc","schema_version":"1.0","event_id":"sha256:9cf5c16c0269a80a8b47afbf07965cb045292038542fcc4adb5b8ea0220e1dbc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JHCF5DBVIJNB2USYJ5VF34RQ3A/bundle.json","state_url":"https://pith.science/pith/JHCF5DBVIJNB2USYJ5VF34RQ3A/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JHCF5DBVIJNB2USYJ5VF34RQ3A/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":"2026-06-01T02:37:03Z","links":{"resolver":"https://pith.science/pith/JHCF5DBVIJNB2USYJ5VF34RQ3A","bundle":"https://pith.science/pith/JHCF5DBVIJNB2USYJ5VF34RQ3A/bundle.json","state":"https://pith.science/pith/JHCF5DBVIJNB2USYJ5VF34RQ3A/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JHCF5DBVIJNB2USYJ5VF34RQ3A/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2001:JHCF5DBVIJNB2USYJ5VF34RQ3A","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":"217155e02fa95b6466853982449c497c57397bf5a48eaa498a76e62047ef4321","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2001-07-27T14:19:35Z","title_canon_sha256":"de96fcca6e6af7599788efcbb7bb4eb882a5a54f44cb249eea609377b145958f"},"schema_version":"1.0","source":{"id":"quant-ph/0107139","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0107139","created_at":"2026-05-18T01:05:04Z"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0107139v1","created_at":"2026-05-18T01:05:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0107139","created_at":"2026-05-18T01:05:04Z"},{"alias_kind":"pith_short_12","alias_value":"JHCF5DBVIJNB","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"JHCF5DBVIJNB2USY","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"JHCF5DBV","created_at":"2026-05-18T12:25:50Z"}],"graph_snapshots":[{"event_id":"sha256:9cf5c16c0269a80a8b47afbf07965cb045292038542fcc4adb5b8ea0220e1dbc","target":"graph","created_at":"2026-05-18T01:05:04Z","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 derive the master equation that governs the evolution of the measured state backwards in time in an open system. This allows us to determine probabilities for a given set of preparation events from the results of subsequent measurements, which has particular relevance to quantum communication.","authors_text":"David T. Pegg, John Jeffers, Ottavia Jedrkiewicz, Stephen M. Barnett","cross_cats":[],"headline":"","license":"","primary_cat":"quant-ph","submitted_at":"2001-07-27T14:19:35Z","title":"Master Equation for Retrodiction of Quantum Communication Signals"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0107139","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:e640028a547b34b042255e6bed27b923b73c945b8152efa70d5eda77a2a25caf","target":"record","created_at":"2026-05-18T01:05:04Z","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":"217155e02fa95b6466853982449c497c57397bf5a48eaa498a76e62047ef4321","cross_cats_sorted":[],"license":"","primary_cat":"quant-ph","submitted_at":"2001-07-27T14:19:35Z","title_canon_sha256":"de96fcca6e6af7599788efcbb7bb4eb882a5a54f44cb249eea609377b145958f"},"schema_version":"1.0","source":{"id":"quant-ph/0107139","kind":"arxiv","version":1}},"canonical_sha256":"49c45e8c35425a1d52584f6a5df230d8180279d29d77a0aa992955f24acd5cfb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"49c45e8c35425a1d52584f6a5df230d8180279d29d77a0aa992955f24acd5cfb","first_computed_at":"2026-05-18T01:05:04.881298Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:05:04.881298Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VrTxnDwyfZjhT9NfiPcbZUuu30pNX9lQAWtovZpsRpwr1cUq+hNsjwE5WAXjY8gn3QKElKkUmzVH3ltfk3Z7AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:05:04.882135Z","signed_message":"canonical_sha256_bytes"},"source_id":"quant-ph/0107139","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e640028a547b34b042255e6bed27b923b73c945b8152efa70d5eda77a2a25caf","sha256:9cf5c16c0269a80a8b47afbf07965cb045292038542fcc4adb5b8ea0220e1dbc"],"state_sha256":"f754ad648533aeaa485b60a63965b46c4744ea4e5b505a6a1dd38723893bad6c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/k7vJRj2vJRjB03G2frHsezawE+T1cVoz8l1eRWYh2UOXRAjkkC/ptBk8RAualRGcAmSK0yHABO86mgN76L9AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T02:37:03.121249Z","bundle_sha256":"e202b3c0ff3d5d62aea44fa32f7f22703377d7d1424937631134f6f3ea191694"}}