{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:2WXJROQ52GXXK5234TR5DPATKZ","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":"49c2673ea5c5264f0cc80880bb2ecfa95ecd39f725b95d10e9ff37fa718a322b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-11-06T07:41:49Z","title_canon_sha256":"a27254d9a81f73ac9d5433f106ca087ab93034e92bc341960a3e61df3359a8c0"},"schema_version":"1.0","source":{"id":"1111.1381","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1111.1381","created_at":"2026-05-18T04:03:55Z"},{"alias_kind":"arxiv_version","alias_value":"1111.1381v1","created_at":"2026-05-18T04:03:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1111.1381","created_at":"2026-05-18T04:03:55Z"},{"alias_kind":"pith_short_12","alias_value":"2WXJROQ52GXX","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_16","alias_value":"2WXJROQ52GXXK523","created_at":"2026-05-18T12:26:18Z"},{"alias_kind":"pith_short_8","alias_value":"2WXJROQ5","created_at":"2026-05-18T12:26:18Z"}],"graph_snapshots":[{"event_id":"sha256:1184e884d62a06b89533299ff796cf30fe75ac4aadf468a1c6706eed869cd955","target":"graph","created_at":"2026-05-18T04:03:55Z","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":"It has been shown that inter-spin interaction strengths in a spins-1/2 chain can be evaluated by accessing one of the edge spins only. We demonstrate this experimentally for the simplest case, a three-spin chain, with nuclear magnetic resonance (NMR) technique. The three spins in the chain interact through nearest-neighbor Ising interactions under site-dependent transverse fields. The employed molecule is an alanine containing three $^{13}$C nuclei, each of which has spin-1/2.","authors_text":"Daniel Burgarth, Elham Hosseini Lapasar, Koji Maruyama, Mikio Nakahara, Takeji Takui, Yasushi Kondo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-11-06T07:41:49Z","title":"Estimation of Coupling Constants of a Three-Spin Chain: Case Study of Hamiltonian Tomography with NMR"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1111.1381","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":"sha256:2b031aee200992cf3fa8b2615b8b91e63b4df8502daad607d49426c83bce336d","target":"record","created_at":"2026-05-18T04:03:55Z","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":"49c2673ea5c5264f0cc80880bb2ecfa95ecd39f725b95d10e9ff37fa718a322b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-11-06T07:41:49Z","title_canon_sha256":"a27254d9a81f73ac9d5433f106ca087ab93034e92bc341960a3e61df3359a8c0"},"schema_version":"1.0","source":{"id":"1111.1381","kind":"arxiv","version":1}},"canonical_sha256":"d5ae98ba1dd1af75775be4e3d1bc13565bd406678f4dfd85cc4c8dec3efb2103","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d5ae98ba1dd1af75775be4e3d1bc13565bd406678f4dfd85cc4c8dec3efb2103","first_computed_at":"2026-05-18T04:03:55.691572Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:03:55.691572Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lI5qVYO5IRgs1OFHQonZC/f820tG4gtTSG4Nctu7RnHlNsHYi1X6mKDPinradQwMgOFFj+vzcQdQswEZYDZrDA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:03:55.692074Z","signed_message":"canonical_sha256_bytes"},"source_id":"1111.1381","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2b031aee200992cf3fa8b2615b8b91e63b4df8502daad607d49426c83bce336d","sha256:1184e884d62a06b89533299ff796cf30fe75ac4aadf468a1c6706eed869cd955"],"state_sha256":"f99a51fdb8e8f3520643aa5bfc14cc11860d68ed8fe9cc259f1c7ce0d7956a62"}