{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:U7SGHGDPDP2PKWWGIHKFMEH34N","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":"f3426f4e830923aac096acb2113fac2bee57cc91b40b76d8ccbf1168158a5f34","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-05-20T09:45:54Z","title_canon_sha256":"5690feaf94057307f6c7f1b3089050360c4525dc111594ab4c37d19870376c34"},"schema_version":"1.0","source":{"id":"1305.4475","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.4475","created_at":"2026-05-18T03:22:16Z"},{"alias_kind":"arxiv_version","alias_value":"1305.4475v2","created_at":"2026-05-18T03:22:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.4475","created_at":"2026-05-18T03:22:16Z"},{"alias_kind":"pith_short_12","alias_value":"U7SGHGDPDP2P","created_at":"2026-05-18T12:28:02Z"},{"alias_kind":"pith_short_16","alias_value":"U7SGHGDPDP2PKWWG","created_at":"2026-05-18T12:28:02Z"},{"alias_kind":"pith_short_8","alias_value":"U7SGHGDP","created_at":"2026-05-18T12:28:02Z"}],"graph_snapshots":[{"event_id":"sha256:1b16e12df7d91dc25588cc51d3eace8bdf0b3588726e25227de7eca62937409e","target":"graph","created_at":"2026-05-18T03:22:16Z","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":"We address the experimental determination of entropic quantum discord for systems made of a pair of polarization qubits. We compare results from full and partial tomography and found that the two determinations are statistically compatible, with partial tomography leading to a smaller value of discord for depolarized states. Despite the fact that our states are well described, in terms of fidelity, by families of depolarized or phase-damped states, their entropic discord may be largely different from that predicted for these classes of states, such that no reliable estimation procedure beyond ","authors_text":"Alexander P. Shurupov, Claudia Benedetti, Giorgio Brida, Marco Genovese, Matteo G. A. Paris","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-05-20T09:45:54Z","title":"Experimental estimation of quantum discord for polarization qubit and the use of fidelity to assess quantum correlations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.4475","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:a58e1a73184b2dc256c0506cf88ca86895e5c656a037a72f7e0f5e9ebff98781","target":"record","created_at":"2026-05-18T03:22:16Z","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":"f3426f4e830923aac096acb2113fac2bee57cc91b40b76d8ccbf1168158a5f34","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2013-05-20T09:45:54Z","title_canon_sha256":"5690feaf94057307f6c7f1b3089050360c4525dc111594ab4c37d19870376c34"},"schema_version":"1.0","source":{"id":"1305.4475","kind":"arxiv","version":2}},"canonical_sha256":"a7e463986f1bf4f55ac641d45610fbe3543175086cf5ffed9f977925cb4a06a0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a7e463986f1bf4f55ac641d45610fbe3543175086cf5ffed9f977925cb4a06a0","first_computed_at":"2026-05-18T03:22:16.840020Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:22:16.840020Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ncgABnrEubYfr6TTKPrviIp07ZEPftPfnDb9tRmUSzqSuBGgyvH5wB8lvd4r3EtLoO/Nsj+TvoSC0Tfgnxw7DQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:22:16.840501Z","signed_message":"canonical_sha256_bytes"},"source_id":"1305.4475","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a58e1a73184b2dc256c0506cf88ca86895e5c656a037a72f7e0f5e9ebff98781","sha256:1b16e12df7d91dc25588cc51d3eace8bdf0b3588726e25227de7eca62937409e"],"state_sha256":"1b5c5bf0e27f4d0df1107e0318bb24fea7324c0b8fe97462adb602e2bf383085"}