{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:OU2BZNJKKC6HHBD3OOHAWDKLCU","short_pith_number":"pith:OU2BZNJK","canonical_record":{"source":{"id":"2607.21555","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-07-23T17:37:35Z","cross_cats_sorted":[],"title_canon_sha256":"28dca20fcc3e59d55a22d97d35483790246ac22fda494af5462a443ae327ae73","abstract_canon_sha256":"407683991f8ea5b7937ce019c714ce13cbd8fee9df62e6ebb16f0a7ec40f0f8d"},"schema_version":"1.0"},"canonical_sha256":"75341cb52a50bc73847b738e0b0d4b150b7b65df0b663d008f5387d615fd6a9d","source":{"kind":"arxiv","id":"2607.21555","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.21555","created_at":"2026-07-24T01:24:39Z"},{"alias_kind":"arxiv_version","alias_value":"2607.21555v1","created_at":"2026-07-24T01:24:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.21555","created_at":"2026-07-24T01:24:39Z"},{"alias_kind":"pith_short_12","alias_value":"OU2BZNJKKC6H","created_at":"2026-07-24T01:24:39Z"},{"alias_kind":"pith_short_16","alias_value":"OU2BZNJKKC6HHBD3","created_at":"2026-07-24T01:24:39Z"},{"alias_kind":"pith_short_8","alias_value":"OU2BZNJK","created_at":"2026-07-24T01:24:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:OU2BZNJKKC6HHBD3OOHAWDKLCU","target":"record","payload":{"canonical_record":{"source":{"id":"2607.21555","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-07-23T17:37:35Z","cross_cats_sorted":[],"title_canon_sha256":"28dca20fcc3e59d55a22d97d35483790246ac22fda494af5462a443ae327ae73","abstract_canon_sha256":"407683991f8ea5b7937ce019c714ce13cbd8fee9df62e6ebb16f0a7ec40f0f8d"},"schema_version":"1.0"},"canonical_sha256":"75341cb52a50bc73847b738e0b0d4b150b7b65df0b663d008f5387d615fd6a9d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-24T01:24:39.398105Z","signature_b64":"lG+xMblP/vkr7C+txCkryj1TDNjokGyAx4YLz2Es/Z7rHsmm1zOK19IwkhbN7LZ3gcaEPL5Wh1VQOwuvwew9Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"75341cb52a50bc73847b738e0b0d4b150b7b65df0b663d008f5387d615fd6a9d","last_reissued_at":"2026-07-24T01:24:39.397265Z","signature_status":"signed_v1","first_computed_at":"2026-07-24T01:24:39.397265Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.21555","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":"2026-07-24T01:24:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eYzV4TmkbmvMokY4cUbAoOZqUIPdC+xKTMxhdb41gs2PEq/zOuFoP8djMupj/Mb2eD3ZAdWXcQXgS4TgJHlkBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T03:34:17.599012Z"},"content_sha256":"dde100fb86c7bc4e9569c145d700bd2c511665dd601f7ac0dfb1f1af2e2c8f8f","schema_version":"1.0","event_id":"sha256:dde100fb86c7bc4e9569c145d700bd2c511665dd601f7ac0dfb1f1af2e2c8f8f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:OU2BZNJKKC6HHBD3OOHAWDKLCU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Enhancing Entanglement Purification with Shared Randomness","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Allen Zang, Bikun Li, Eric Chitambar, Liang Jiang, Martin Suchara, Tian Zhong, Xinan Chen","submitted_at":"2026-07-23T17:37:35Z","abstract_excerpt":"Entanglement purification protocols (EPPs) are essential for improving entanglement fidelity to support fault-tolerant distributed quantum information processing. Practical entanglement sources are often heterogeneous and source labels may be unavailable at the EPP layer. We show that classical shared randomness, together with buffer memories, can enhance entanglement purification when source labels are unavailable, without state characterization or EPP circuit optimization. The strategy is to accumulate multiple entanglement distribution rounds and then use shared randomness to shuffle all th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.21555","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2607.21555/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":"2026-07-24T01:24:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rHb6Jk2Ti17OP8cyTaDB8eaErkeoWI6sDCHb7KSBsZaIynC6Vw6YWjjjhZ+zUvU1yZfW3lBW1zAxAUriRCmGAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T03:34:17.599513Z"},"content_sha256":"9961a408a459380e34a2fb8f8b954de5f4a16b4ec4349abfc61b09b7f7a56d30","schema_version":"1.0","event_id":"sha256:9961a408a459380e34a2fb8f8b954de5f4a16b4ec4349abfc61b09b7f7a56d30"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OU2BZNJKKC6HHBD3OOHAWDKLCU/bundle.json","state_url":"https://pith.science/pith/OU2BZNJKKC6HHBD3OOHAWDKLCU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OU2BZNJKKC6HHBD3OOHAWDKLCU/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":"2026-08-16T03:34:17Z","links":{"resolver":"https://pith.science/pith/OU2BZNJKKC6HHBD3OOHAWDKLCU","bundle":"https://pith.science/pith/OU2BZNJKKC6HHBD3OOHAWDKLCU/bundle.json","state":"https://pith.science/pith/OU2BZNJKKC6HHBD3OOHAWDKLCU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OU2BZNJKKC6HHBD3OOHAWDKLCU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:OU2BZNJKKC6HHBD3OOHAWDKLCU","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":"407683991f8ea5b7937ce019c714ce13cbd8fee9df62e6ebb16f0a7ec40f0f8d","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-07-23T17:37:35Z","title_canon_sha256":"28dca20fcc3e59d55a22d97d35483790246ac22fda494af5462a443ae327ae73"},"schema_version":"1.0","source":{"id":"2607.21555","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.21555","created_at":"2026-07-24T01:24:39Z"},{"alias_kind":"arxiv_version","alias_value":"2607.21555v1","created_at":"2026-07-24T01:24:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.21555","created_at":"2026-07-24T01:24:39Z"},{"alias_kind":"pith_short_12","alias_value":"OU2BZNJKKC6H","created_at":"2026-07-24T01:24:39Z"},{"alias_kind":"pith_short_16","alias_value":"OU2BZNJKKC6HHBD3","created_at":"2026-07-24T01:24:39Z"},{"alias_kind":"pith_short_8","alias_value":"OU2BZNJK","created_at":"2026-07-24T01:24:39Z"}],"graph_snapshots":[{"event_id":"sha256:9961a408a459380e34a2fb8f8b954de5f4a16b4ec4349abfc61b09b7f7a56d30","target":"graph","created_at":"2026-07-24T01:24:39Z","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/2607.21555/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Entanglement purification protocols (EPPs) are essential for improving entanglement fidelity to support fault-tolerant distributed quantum information processing. Practical entanglement sources are often heterogeneous and source labels may be unavailable at the EPP layer. We show that classical shared randomness, together with buffer memories, can enhance entanglement purification when source labels are unavailable, without state characterization or EPP circuit optimization. The strategy is to accumulate multiple entanglement distribution rounds and then use shared randomness to shuffle all th","authors_text":"Allen Zang, Bikun Li, Eric Chitambar, Liang Jiang, Martin Suchara, Tian Zhong, Xinan Chen","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-07-23T17:37:35Z","title":"Enhancing Entanglement Purification with Shared Randomness"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.21555","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:dde100fb86c7bc4e9569c145d700bd2c511665dd601f7ac0dfb1f1af2e2c8f8f","target":"record","created_at":"2026-07-24T01:24:39Z","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":"407683991f8ea5b7937ce019c714ce13cbd8fee9df62e6ebb16f0a7ec40f0f8d","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-07-23T17:37:35Z","title_canon_sha256":"28dca20fcc3e59d55a22d97d35483790246ac22fda494af5462a443ae327ae73"},"schema_version":"1.0","source":{"id":"2607.21555","kind":"arxiv","version":1}},"canonical_sha256":"75341cb52a50bc73847b738e0b0d4b150b7b65df0b663d008f5387d615fd6a9d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"75341cb52a50bc73847b738e0b0d4b150b7b65df0b663d008f5387d615fd6a9d","first_computed_at":"2026-07-24T01:24:39.397265Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-24T01:24:39.397265Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lG+xMblP/vkr7C+txCkryj1TDNjokGyAx4YLz2Es/Z7rHsmm1zOK19IwkhbN7LZ3gcaEPL5Wh1VQOwuvwew9Cg==","signature_status":"signed_v1","signed_at":"2026-07-24T01:24:39.398105Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.21555","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dde100fb86c7bc4e9569c145d700bd2c511665dd601f7ac0dfb1f1af2e2c8f8f","sha256:9961a408a459380e34a2fb8f8b954de5f4a16b4ec4349abfc61b09b7f7a56d30"],"state_sha256":"99bb07aa3e984459fd35b3e09b416cda7b746bc83f9ee378dda3caac3599302f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SOgJGd/xU+tnx414lPJCY6SuL7f0zIQFA7DcdcESbLRu4E0HJki0f8GvTmirjDGJMLjtt/D/1SjHUYFlQHuvAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T03:34:17.604491Z","bundle_sha256":"05520a30b4081991c115e85e93a108a62f6edd0ad4521c311e7d6f9f9dc890db"}}