{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:5QKRQ25M3XVBAMC6SUWUIZEU2Z","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":"6eca17e56153594a6fc45e97277b9d67c56517be62b96619171ca73765470d55","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-04-22T19:33:04Z","title_canon_sha256":"517f1d1b088da9fbfd917b201eb4ecae13da5ab2dd5c05b2f747e2db7c03b99b"},"schema_version":"1.0","source":{"id":"1504.05934","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.05934","created_at":"2026-05-18T01:35:30Z"},{"alias_kind":"arxiv_version","alias_value":"1504.05934v1","created_at":"2026-05-18T01:35:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.05934","created_at":"2026-05-18T01:35:30Z"},{"alias_kind":"pith_short_12","alias_value":"5QKRQ25M3XVB","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_16","alias_value":"5QKRQ25M3XVBAMC6","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_8","alias_value":"5QKRQ25M","created_at":"2026-05-18T12:29:05Z"}],"graph_snapshots":[{"event_id":"sha256:7e9be3b5c9097e6df63832e2fbd2dfd37a95559051103c42237a40a9ace3ef8b","target":"graph","created_at":"2026-05-18T01:35:30Z","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 study the problem of closing the detection loophole in three-qubit Bell tests, the experimentally most relevant case beyond the usual bipartite scenario, and show that the minimal detection efficiencies required can be considerably lowered compared to the two-qubit case. The lowest reported detection efficiency thresholds for two and three qubits so far are $\\sim66.7\\%$ and $60\\%$, respectively. Using the three-qubit W state and a 3-setting Bell inequality, we beat these thresholds and with an 8-setting Bell inequality we reach $50.13\\%$. We also investigate generic three-qubit states which","authors_text":"Karoly F. Pal, Tamas Vertesi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-04-22T19:33:04Z","title":"Closing the detection loophole in tripartite Bell tests using the W state"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.05934","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":"sha256:9506bd6cd923b4e6dc1d55e310f03f6695060146776c33b0d1981c3766599601","target":"record","created_at":"2026-05-18T01:35:30Z","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":"6eca17e56153594a6fc45e97277b9d67c56517be62b96619171ca73765470d55","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-04-22T19:33:04Z","title_canon_sha256":"517f1d1b088da9fbfd917b201eb4ecae13da5ab2dd5c05b2f747e2db7c03b99b"},"schema_version":"1.0","source":{"id":"1504.05934","kind":"arxiv","version":1}},"canonical_sha256":"ec15186bacddea10305e952d446494d64ab8e6cd4e23808f575434829d12c57a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ec15186bacddea10305e952d446494d64ab8e6cd4e23808f575434829d12c57a","first_computed_at":"2026-05-18T01:35:30.323958Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:35:30.323958Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0TztVdfFaYIc0MHSUMIXdO7Ot7n345HTvQysJUl3QxTQiyZatsUTMOeTbEWZcJlNLZi7/94qzRy7Ky9acyPdBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:35:30.324405Z","signed_message":"canonical_sha256_bytes"},"source_id":"1504.05934","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9506bd6cd923b4e6dc1d55e310f03f6695060146776c33b0d1981c3766599601","sha256:7e9be3b5c9097e6df63832e2fbd2dfd37a95559051103c42237a40a9ace3ef8b"],"state_sha256":"b7ead9ab91cb0fae8d22a3cd2ed25fc81c07e8fbbd36babf041c2bc43aaf9544"}