{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:37IAMSM65C2RZWIY32A3XLMOCW","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":"0a1ded7292d366946249c663bd380e26d54f0af82ca40a12f6a6a029cf2282a9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-08-25T14:47:36Z","title_canon_sha256":"5dd5bbf25bda9ffc2e30b383857cb9468d86aa3817bf0a0a33fb65db80c1c1bd"},"schema_version":"1.0","source":{"id":"1308.5413","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.5413","created_at":"2026-05-18T03:01:24Z"},{"alias_kind":"arxiv_version","alias_value":"1308.5413v2","created_at":"2026-05-18T03:01:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.5413","created_at":"2026-05-18T03:01:24Z"},{"alias_kind":"pith_short_12","alias_value":"37IAMSM65C2R","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_16","alias_value":"37IAMSM65C2RZWIY","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_8","alias_value":"37IAMSM6","created_at":"2026-05-18T12:27:32Z"}],"graph_snapshots":[{"event_id":"sha256:c87504d9b0669e3e909d26dfed2d003e2b6742ae3f30dc02332d5f2885e44abb","target":"graph","created_at":"2026-05-18T03:01:24Z","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":"Eigenvalues of a density matrix characterize well the quantum state's properties, such as coherence and entanglement. We propose a simple method to determine all the eigenvalues of an unknown density matrix of a finite-dimensional system in a single experimental setting. Without fully reconstructing a quantum state, eigenvalues are determined with the minimal number of parameters obtained by a measurement of a single observable. Moreover, its implementation is illustrated in linear optical and superconducting systems.","authors_text":"Franco Nori, Gen Kimura, Hiromichi Nakazato, Mitsunori Kanazawa, Tohru Tanaka, Yukihiro Ota","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-08-25T14:47:36Z","title":"Determining eigenvalues of a density matrix with minimal information in a single experimental setting"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.5413","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:e2b0274dd8af3dbebca8d944305b809b8f3d5a2d022d1afbb8baf5a35de7919e","target":"record","created_at":"2026-05-18T03:01:24Z","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":"0a1ded7292d366946249c663bd380e26d54f0af82ca40a12f6a6a029cf2282a9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-08-25T14:47:36Z","title_canon_sha256":"5dd5bbf25bda9ffc2e30b383857cb9468d86aa3817bf0a0a33fb65db80c1c1bd"},"schema_version":"1.0","source":{"id":"1308.5413","kind":"arxiv","version":2}},"canonical_sha256":"dfd006499ee8b51cd918de81bbad8e1595f4db958c561265e910b813bc3c325a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dfd006499ee8b51cd918de81bbad8e1595f4db958c561265e910b813bc3c325a","first_computed_at":"2026-05-18T03:01:24.160526Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:01:24.160526Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sYkAA2GjBjw4Yvn16jgBs2sTG9Bu9C4p8JtXwE/mLeKYdTZnh2Dx9bpZSPSOEZD73eZYTNRNxXY5p2LMcuYgCg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:01:24.161196Z","signed_message":"canonical_sha256_bytes"},"source_id":"1308.5413","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e2b0274dd8af3dbebca8d944305b809b8f3d5a2d022d1afbb8baf5a35de7919e","sha256:c87504d9b0669e3e909d26dfed2d003e2b6742ae3f30dc02332d5f2885e44abb"],"state_sha256":"e6201bc670f31d0110b79399317ce17c42293be5af0ea4e9589da15108c6d4d4"}