{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:S25KTZTD53KW5CNAEMPJBBUFER","short_pith_number":"pith:S25KTZTD","canonical_record":{"source":{"id":"2207.01643","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2022-07-04T18:00:07Z","cross_cats_sorted":[],"title_canon_sha256":"f5dea912a62c6b5036d0b23d42c38aa3a8c67332fb90e35ef33a67e2738b41cb","abstract_canon_sha256":"102ae6fdaece63ae3f54fe86759e02fc5a03e15b74d6a97d483481cf550bc84b"},"schema_version":"1.0"},"canonical_sha256":"96baa9e663eed56e89a0231e90868524439b7d883f4136f1ac357ee6b89d7aed","source":{"kind":"arxiv","id":"2207.01643","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2207.01643","created_at":"2026-07-05T06:48:02Z"},{"alias_kind":"arxiv_version","alias_value":"2207.01643v2","created_at":"2026-07-05T06:48:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2207.01643","created_at":"2026-07-05T06:48:02Z"},{"alias_kind":"pith_short_12","alias_value":"S25KTZTD53KW","created_at":"2026-07-05T06:48:02Z"},{"alias_kind":"pith_short_16","alias_value":"S25KTZTD53KW5CNA","created_at":"2026-07-05T06:48:02Z"},{"alias_kind":"pith_short_8","alias_value":"S25KTZTD","created_at":"2026-07-05T06:48:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:S25KTZTD53KW5CNAEMPJBBUFER","target":"record","payload":{"canonical_record":{"source":{"id":"2207.01643","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2022-07-04T18:00:07Z","cross_cats_sorted":[],"title_canon_sha256":"f5dea912a62c6b5036d0b23d42c38aa3a8c67332fb90e35ef33a67e2738b41cb","abstract_canon_sha256":"102ae6fdaece63ae3f54fe86759e02fc5a03e15b74d6a97d483481cf550bc84b"},"schema_version":"1.0"},"canonical_sha256":"96baa9e663eed56e89a0231e90868524439b7d883f4136f1ac357ee6b89d7aed","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:48:02.871729Z","signature_b64":"QP1Z5Rl4IxvqedbS1XjODa+8/ono9CDJi0/vIjBo9CormNJzTtLU940FbMNzTWyvK0sRw5C9jBIbLv5WKXj8CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"96baa9e663eed56e89a0231e90868524439b7d883f4136f1ac357ee6b89d7aed","last_reissued_at":"2026-07-05T06:48:02.871230Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:48:02.871230Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2207.01643","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T06:48:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jcYpY3EAvnKs0uv2ZISWR5Ot44G09em7Xdpq34edKreAHGuZE7x1NlDDaMwci0gAdPdErPMj/3g5lQU97F7DCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T13:38:58.773904Z"},"content_sha256":"890d9d3fe0442c1a85f1de3cd8eb33896ca2b7695b04df21022c93f0f4e0b8de","schema_version":"1.0","event_id":"sha256:890d9d3fe0442c1a85f1de3cd8eb33896ca2b7695b04df21022c93f0f4e0b8de"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:S25KTZTD53KW5CNAEMPJBBUFER","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Conference key agreement in a quantum network","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Alessandro Fedrizzi, Alexander Pickston, Andr\\'es Ulibarrena, Christopher L. Morrison, Federico Grasselli, Francesco Graffitti, Joseph Ho, Massimiliano Proietti, Peter Barrow","submitted_at":"2022-07-04T18:00:07Z","abstract_excerpt":"Quantum conference key agreement (QCKA) allows multiple users to establish a secure key from a shared multi-partite entangled state. In a quantum network, this protocol can be efficiently implemented using a single copy of a N-qubit Greenberger-Horne-Zeilinger (GHZ) state to distil a secure N-user conference key bit, whereas up to N-1 entanglement pairs are consumed in the traditional pair-wise protocol. We demonstrate the advantage provided by GHZ states in a testbed consisting of a photonic six-user quantum network, where four users can distil either a GHZ state or the required number of Bel"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2207.01643","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2207.01643/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T06:48:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AEJWvt9Jdwi0D9Muse1DtsA1ZfICC73/WNcQMlu0F7YFBABUdkzR0o1x068uTDwWmR3MvBykVV7+gRq+zAzOBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T13:38:58.774980Z"},"content_sha256":"82ece57f9ceea4f8b53243879a82c237e8be5b97cf5d5b1d7c9d598814fcd3df","schema_version":"1.0","event_id":"sha256:82ece57f9ceea4f8b53243879a82c237e8be5b97cf5d5b1d7c9d598814fcd3df"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/S25KTZTD53KW5CNAEMPJBBUFER/bundle.json","state_url":"https://pith.science/pith/S25KTZTD53KW5CNAEMPJBBUFER/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/S25KTZTD53KW5CNAEMPJBBUFER/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":"2026-08-10T13:38:58Z","links":{"resolver":"https://pith.science/pith/S25KTZTD53KW5CNAEMPJBBUFER","bundle":"https://pith.science/pith/S25KTZTD53KW5CNAEMPJBBUFER/bundle.json","state":"https://pith.science/pith/S25KTZTD53KW5CNAEMPJBBUFER/state.json","well_known_bundle":"https://pith.science/.well-known/pith/S25KTZTD53KW5CNAEMPJBBUFER/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:S25KTZTD53KW5CNAEMPJBBUFER","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":"102ae6fdaece63ae3f54fe86759e02fc5a03e15b74d6a97d483481cf550bc84b","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2022-07-04T18:00:07Z","title_canon_sha256":"f5dea912a62c6b5036d0b23d42c38aa3a8c67332fb90e35ef33a67e2738b41cb"},"schema_version":"1.0","source":{"id":"2207.01643","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2207.01643","created_at":"2026-07-05T06:48:02Z"},{"alias_kind":"arxiv_version","alias_value":"2207.01643v2","created_at":"2026-07-05T06:48:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2207.01643","created_at":"2026-07-05T06:48:02Z"},{"alias_kind":"pith_short_12","alias_value":"S25KTZTD53KW","created_at":"2026-07-05T06:48:02Z"},{"alias_kind":"pith_short_16","alias_value":"S25KTZTD53KW5CNA","created_at":"2026-07-05T06:48:02Z"},{"alias_kind":"pith_short_8","alias_value":"S25KTZTD","created_at":"2026-07-05T06:48:02Z"}],"graph_snapshots":[{"event_id":"sha256:82ece57f9ceea4f8b53243879a82c237e8be5b97cf5d5b1d7c9d598814fcd3df","target":"graph","created_at":"2026-07-05T06:48:02Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2207.01643/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Quantum conference key agreement (QCKA) allows multiple users to establish a secure key from a shared multi-partite entangled state. In a quantum network, this protocol can be efficiently implemented using a single copy of a N-qubit Greenberger-Horne-Zeilinger (GHZ) state to distil a secure N-user conference key bit, whereas up to N-1 entanglement pairs are consumed in the traditional pair-wise protocol. We demonstrate the advantage provided by GHZ states in a testbed consisting of a photonic six-user quantum network, where four users can distil either a GHZ state or the required number of Bel","authors_text":"Alessandro Fedrizzi, Alexander Pickston, Andr\\'es Ulibarrena, Christopher L. Morrison, Federico Grasselli, Francesco Graffitti, Joseph Ho, Massimiliano Proietti, Peter Barrow","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2022-07-04T18:00:07Z","title":"Conference key agreement in a quantum network"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2207.01643","kind":"arxiv","version":2},"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":"sha256:890d9d3fe0442c1a85f1de3cd8eb33896ca2b7695b04df21022c93f0f4e0b8de","target":"record","created_at":"2026-07-05T06:48:02Z","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":"102ae6fdaece63ae3f54fe86759e02fc5a03e15b74d6a97d483481cf550bc84b","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2022-07-04T18:00:07Z","title_canon_sha256":"f5dea912a62c6b5036d0b23d42c38aa3a8c67332fb90e35ef33a67e2738b41cb"},"schema_version":"1.0","source":{"id":"2207.01643","kind":"arxiv","version":2}},"canonical_sha256":"96baa9e663eed56e89a0231e90868524439b7d883f4136f1ac357ee6b89d7aed","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"96baa9e663eed56e89a0231e90868524439b7d883f4136f1ac357ee6b89d7aed","first_computed_at":"2026-07-05T06:48:02.871230Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:48:02.871230Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QP1Z5Rl4IxvqedbS1XjODa+8/ono9CDJi0/vIjBo9CormNJzTtLU940FbMNzTWyvK0sRw5C9jBIbLv5WKXj8CA==","signature_status":"signed_v1","signed_at":"2026-07-05T06:48:02.871729Z","signed_message":"canonical_sha256_bytes"},"source_id":"2207.01643","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:890d9d3fe0442c1a85f1de3cd8eb33896ca2b7695b04df21022c93f0f4e0b8de","sha256:82ece57f9ceea4f8b53243879a82c237e8be5b97cf5d5b1d7c9d598814fcd3df"],"state_sha256":"aedf8d2223ef50f44c2830a6a73f47706f175a1192632a29b50826e406ab52e7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ppTq6AoZytfF/xGpfPcKgmddzCOYjuK411o0i0mtq6wJ5HYjM7tm9zEkl6HK3wJ7cLB/qddEQmfQY3DQ6EazBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-10T13:38:58.787113Z","bundle_sha256":"e4400fdf1ef5ccb5920fdcd2e0251e2e74ce4cf39897b1b0076e913c92a1591b"}}