{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2001:W5WV5ADE4UYNP3FXKF42ILNUST","short_pith_number":"pith:W5WV5ADE","schema_version":"1.0","canonical_sha256":"b76d5e8064e530d7ecb75179a42db494e85cd2b19a9354632a7425089ac52a3e","source":{"kind":"arxiv","id":"quant-ph/0107045","version":2},"attestation_state":"computed","paper":{"title":"Nonsequential positive-operator-valued measurements on entangled mixed states do not always violate a Bell inequality","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Jonathan Barrett","submitted_at":"2001-07-07T20:24:57Z","abstract_excerpt":"We present a local-hidden-variable model for positive-operator-valued measurements (an LHVPOV model) on a class of entangled generalized Werner states, thus demonstrating that such measurements do not always violate a Bell-type inequality. We also show that, in general, if the state $\\rho'$ can be obtained from $\\rho$ with certainty by local quantum operations without classical communication then an LHVPOV model for the state $\\rho$ implies the existence of such a model for $\\rho'$."},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"quant-ph/0107045","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2001-07-07T20:24:57Z","cross_cats_sorted":[],"title_canon_sha256":"c4a72ef45e387640708994586f5da41bf3de2ba5367b8519e724055ad2936137","abstract_canon_sha256":"ab05e478ab6151a3498db8426703c30e00eaa8a49dc5aa393c4fa0014c99011a"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:29:01.476120Z","signature_b64":"Es06w7blMEudsxoHNBL8+PLrLpESjhWT6fReSFlrWfYhoKbyLoPmTd8vZ5AFDDnNcvOoUznYXTbKenFYqd1YCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b76d5e8064e530d7ecb75179a42db494e85cd2b19a9354632a7425089ac52a3e","last_reissued_at":"2026-07-04T16:29:01.475708Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:29:01.475708Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Nonsequential positive-operator-valued measurements on entangled mixed states do not always violate a Bell inequality","license":"","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Jonathan Barrett","submitted_at":"2001-07-07T20:24:57Z","abstract_excerpt":"We present a local-hidden-variable model for positive-operator-valued measurements (an LHVPOV model) on a class of entangled generalized Werner states, thus demonstrating that such measurements do not always violate a Bell-type inequality. We also show that, in general, if the state $\\rho'$ can be obtained from $\\rho$ with certainty by local quantum operations without classical communication then an LHVPOV model for the state $\\rho$ implies the existence of such a model for $\\rho'$."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0107045","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/quant-ph/0107045/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0107045","created_at":"2026-07-04T16:29:01.475763+00:00"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0107045v2","created_at":"2026-07-04T16:29:01.475763+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0107045","created_at":"2026-07-04T16:29:01.475763+00:00"},{"alias_kind":"pith_short_12","alias_value":"W5WV5ADE4UYN","created_at":"2026-07-04T16:29:01.475763+00:00"},{"alias_kind":"pith_short_16","alias_value":"W5WV5ADE4UYNP3FX","created_at":"2026-07-04T16:29:01.475763+00:00"},{"alias_kind":"pith_short_8","alias_value":"W5WV5ADE","created_at":"2026-07-04T16:29:01.475763+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"1906.10929","citing_title":"Entanglement Certification $-$ From Theory to Experiment","ref_index":21,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/W5WV5ADE4UYNP3FXKF42ILNUST","json":"https://pith.science/pith/W5WV5ADE4UYNP3FXKF42ILNUST.json","graph_json":"https://pith.science/api/pith-number/W5WV5ADE4UYNP3FXKF42ILNUST/graph.json","events_json":"https://pith.science/api/pith-number/W5WV5ADE4UYNP3FXKF42ILNUST/events.json","paper":"https://pith.science/paper/W5WV5ADE"},"agent_actions":{"view_html":"https://pith.science/pith/W5WV5ADE4UYNP3FXKF42ILNUST","download_json":"https://pith.science/pith/W5WV5ADE4UYNP3FXKF42ILNUST.json","view_paper":"https://pith.science/paper/W5WV5ADE","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=quant-ph/0107045&json=true","fetch_graph":"https://pith.science/api/pith-number/W5WV5ADE4UYNP3FXKF42ILNUST/graph.json","fetch_events":"https://pith.science/api/pith-number/W5WV5ADE4UYNP3FXKF42ILNUST/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/W5WV5ADE4UYNP3FXKF42ILNUST/action/timestamp_anchor","attest_storage":"https://pith.science/pith/W5WV5ADE4UYNP3FXKF42ILNUST/action/storage_attestation","attest_author":"https://pith.science/pith/W5WV5ADE4UYNP3FXKF42ILNUST/action/author_attestation","sign_citation":"https://pith.science/pith/W5WV5ADE4UYNP3FXKF42ILNUST/action/citation_signature","submit_replication":"https://pith.science/pith/W5WV5ADE4UYNP3FXKF42ILNUST/action/replication_record"}},"created_at":"2026-07-04T16:29:01.475763+00:00","updated_at":"2026-07-04T16:29:01.475763+00:00"}