{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:4H44QWDQMPEBPEQPQFQRXN25MO","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":"4115492a3b28dcc81bf31a6bcc5c717e349e5f0a21bd35d05ce89a3e968bea8b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-01-28T08:35:28Z","title_canon_sha256":"cb62b8174ef0fed4ce54dd7ed49b3b01d3cf29a1ff096cbdcd231e79a02dbb8b"},"schema_version":"1.0","source":{"id":"1501.07026","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.07026","created_at":"2026-05-18T02:12:10Z"},{"alias_kind":"arxiv_version","alias_value":"1501.07026v1","created_at":"2026-05-18T02:12:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.07026","created_at":"2026-05-18T02:12:10Z"},{"alias_kind":"pith_short_12","alias_value":"4H44QWDQMPEB","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_16","alias_value":"4H44QWDQMPEBPEQP","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_8","alias_value":"4H44QWDQ","created_at":"2026-05-18T12:29:05Z"}],"graph_snapshots":[{"event_id":"sha256:e346bab4f7867c1087291736e7d9a21deaa16c80bad9928f98de7cb7340167fc","target":"graph","created_at":"2026-05-18T02:12:10Z","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":"For every N-qubit density matrix written in the computational basis, an associated \"X-density matrix\" can be obtained by vanishing all entries out of the main- and anti-diagonals. It is very simple to compute the genuine multipartite (GM) concurrence of this associated N-qubit X-state, which, moreover, lower bounds the GM-concurrence of the original (non-X) state. In this paper, we rely on these facts to introduce and benchmark a heuristic for estimating the GM-concurrence of an arbitrary multiqubit mixed state. By explicitly considering two classes of mixed states, we illustrate that our esti","authors_text":"Gerard J. Milburn, Marcelo A. Marchiolli, Paulo E. M. F. Mendonca","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-01-28T08:35:28Z","title":"Heuristic for estimation of multiqubit genuine multipartite entanglement"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.07026","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":"sha256:2db29a3718ecdef1ac2fb1ed62e205835d52eb05d852ae2b59dcfad14f53f189","target":"record","created_at":"2026-05-18T02:12:10Z","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":"4115492a3b28dcc81bf31a6bcc5c717e349e5f0a21bd35d05ce89a3e968bea8b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-01-28T08:35:28Z","title_canon_sha256":"cb62b8174ef0fed4ce54dd7ed49b3b01d3cf29a1ff096cbdcd231e79a02dbb8b"},"schema_version":"1.0","source":{"id":"1501.07026","kind":"arxiv","version":1}},"canonical_sha256":"e1f9c8587063c817920f81611bb75d639303d50eda2aca01c95847cb6d12ba18","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e1f9c8587063c817920f81611bb75d639303d50eda2aca01c95847cb6d12ba18","first_computed_at":"2026-05-18T02:12:10.906594Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:12:10.906594Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"79oHi5L+Mcn7G5h0H0pfIcorF0j8d6LwiquMDMINCve/Xm+lIta7v+f7U7QF4ylZLa6kcwD9IQxstpHCzRTxAg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:12:10.907329Z","signed_message":"canonical_sha256_bytes"},"source_id":"1501.07026","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2db29a3718ecdef1ac2fb1ed62e205835d52eb05d852ae2b59dcfad14f53f189","sha256:e346bab4f7867c1087291736e7d9a21deaa16c80bad9928f98de7cb7340167fc"],"state_sha256":"e7ee34f132ae7df0b0b68d0ad0bb1230d0d02d98a814938f0dad5229d902e18b"}