{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:DFE3DXL5VFJOHEQOI7G4Y46LKT","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":"3782959cfba0ed8a86da4c9c1e126f56ff439753ef2f5347b6c0aec140892fb9","cross_cats_sorted":["cond-mat.mes-hall","cond-mat.stat-mech"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-02-24T07:46:44Z","title_canon_sha256":"b55b12fdd92d7ab4ed6fbece5171dca06f645644eeed59c897a487f517c6567f"},"schema_version":"1.0","source":{"id":"1502.06704","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.06704","created_at":"2026-05-18T00:46:43Z"},{"alias_kind":"arxiv_version","alias_value":"1502.06704v2","created_at":"2026-05-18T00:46:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.06704","created_at":"2026-05-18T00:46:43Z"},{"alias_kind":"pith_short_12","alias_value":"DFE3DXL5VFJO","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_16","alias_value":"DFE3DXL5VFJOHEQO","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_8","alias_value":"DFE3DXL5","created_at":"2026-05-18T12:29:17Z"}],"graph_snapshots":[{"event_id":"sha256:c9c67f9dd0267fae4a341d753a8385b61e11b28014b14966538727b9a6d9f841","target":"graph","created_at":"2026-05-18T00:46:43Z","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":"Irreversibility is one of the most intriguing concepts in physics. While microscopic physical laws are perfectly reversible, macroscopic average behavior has a preferred direction of time. According to the second law of thermodynamics, this arrow of time is associated with a positive mean entropy production. Using a nuclear magnetic resonance setup, we measure the nonequilibrium entropy produced in an isolated spin-1/2 system following fast quenches of an external magnetic field and experimentally demonstrate that it is equal to the entropic distance, expressed by the Kullback-Leibler divergen","authors_text":"A. M. Souza, E. Lutz, I. S. Oliveira, M. Paternostro, R. M. Serra, R. S. Sarthour, T. B. Batalhao","cross_cats":["cond-mat.mes-hall","cond-mat.stat-mech"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-02-24T07:46:44Z","title":"Irreversibility and the arrow of time in a quenched quantum system"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.06704","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":"sha256:170353d4d9c7ea3b2dc7a6d394cf2976ce1bad1e547fbd522d578006c1c016ec","target":"record","created_at":"2026-05-18T00:46:43Z","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":"3782959cfba0ed8a86da4c9c1e126f56ff439753ef2f5347b6c0aec140892fb9","cross_cats_sorted":["cond-mat.mes-hall","cond-mat.stat-mech"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2015-02-24T07:46:44Z","title_canon_sha256":"b55b12fdd92d7ab4ed6fbece5171dca06f645644eeed59c897a487f517c6567f"},"schema_version":"1.0","source":{"id":"1502.06704","kind":"arxiv","version":2}},"canonical_sha256":"1949b1dd7da952e3920e47cdcc73cb54f80a4444b344438fb27077794aeb29e5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1949b1dd7da952e3920e47cdcc73cb54f80a4444b344438fb27077794aeb29e5","first_computed_at":"2026-05-18T00:46:43.324015Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:46:43.324015Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4J23yc/sG8B1aDAGfi4x43xD0K+N92TTb8R2nuO1BaWVf0FVXQJVr8TAqYWZlpqBIB9epwQOdZDU+lA6d12EAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:46:43.324657Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.06704","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:170353d4d9c7ea3b2dc7a6d394cf2976ce1bad1e547fbd522d578006c1c016ec","sha256:c9c67f9dd0267fae4a341d753a8385b61e11b28014b14966538727b9a6d9f841"],"state_sha256":"7c398a743e209321f2407a4557279d8bf6eafc455f7d7c739581175693d98398"}