{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:V4X4V55GSKYQCJEWHLUOISOJ3C","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":"19c911e12fc7d50e7219740d21afce6a017f6be93d1282a2a09865d1005cc153","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2021-10-10T12:53:07Z","title_canon_sha256":"c9b4f7c1cc3969a9511fff75b3f0f6a50863ec6076bf2073f3b6a8311e4963e5"},"schema_version":"1.0","source":{"id":"2110.04783","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2110.04783","created_at":"2026-07-05T03:43:05Z"},{"alias_kind":"arxiv_version","alias_value":"2110.04783v2","created_at":"2026-07-05T03:43:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2110.04783","created_at":"2026-07-05T03:43:05Z"},{"alias_kind":"pith_short_12","alias_value":"V4X4V55GSKYQ","created_at":"2026-07-05T03:43:05Z"},{"alias_kind":"pith_short_16","alias_value":"V4X4V55GSKYQCJEW","created_at":"2026-07-05T03:43:05Z"},{"alias_kind":"pith_short_8","alias_value":"V4X4V55G","created_at":"2026-07-05T03:43:05Z"}],"graph_snapshots":[{"event_id":"sha256:dddf34067673e9c45a6a9c4fda77376acfa7c99e7311df2ce03024449d8f3f15","target":"graph","created_at":"2026-07-05T03:43:05Z","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/2110.04783/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The generation of spin-entangled electrons is an important prerequisite for future solid-state quantum technologies. Cooper pairs in a superconductor can be split into separate electrons in a spin-singlet state, however, detecting their entanglement remains an open experimental challenge. Proposals to detect the entanglement by violating a Bell inequality typically require a large number of current cross-correlation measurements, and not all entangled states can be detected in this way. Here, we instead formulate an entanglement witness that can detect the spin-entanglement using only three cr","authors_text":"Christian Flindt, Fredrik Brange, Minh Tam","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2021-10-10T12:53:07Z","title":"Optimal Entanglement Witness for Cooper Pair Splitters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2110.04783","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:da6c59f97a732675736048f54b2bb5613be3716981cce51b91a8b579e22bb47c","target":"record","created_at":"2026-07-05T03:43:05Z","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":"19c911e12fc7d50e7219740d21afce6a017f6be93d1282a2a09865d1005cc153","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2021-10-10T12:53:07Z","title_canon_sha256":"c9b4f7c1cc3969a9511fff75b3f0f6a50863ec6076bf2073f3b6a8311e4963e5"},"schema_version":"1.0","source":{"id":"2110.04783","kind":"arxiv","version":2}},"canonical_sha256":"af2fcaf7a692b10124963ae8e449c9d8a7eb09f8b139e76c1a6b59f2f2645687","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"af2fcaf7a692b10124963ae8e449c9d8a7eb09f8b139e76c1a6b59f2f2645687","first_computed_at":"2026-07-05T03:43:05.394623Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:43:05.394623Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wzw45X10hmr+u2QN1xQvtDL6gzjkCirQOBEiosQP6KOzvMT81j0LtVyxaP+/LtsrIBGZ1iQWV8zS/31Wa74jAg==","signature_status":"signed_v1","signed_at":"2026-07-05T03:43:05.395083Z","signed_message":"canonical_sha256_bytes"},"source_id":"2110.04783","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:da6c59f97a732675736048f54b2bb5613be3716981cce51b91a8b579e22bb47c","sha256:dddf34067673e9c45a6a9c4fda77376acfa7c99e7311df2ce03024449d8f3f15"],"state_sha256":"6b93b2697a6998c1a74949f9fa186e3dd7ae3d67ff434cdaac6fd1ed35159bbc"}