{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:LGOYDSNH2XUFUDPR6OU2UNZ664","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":"a77fa5bc6d695c1f65f5a2ada4322c4a865923f1e19de4d73215e482ca5955ac","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-08-01T04:56:17Z","title_canon_sha256":"1328a161c3ba57cba2eba697dfcd0c3ddc004162b8c652a60d0c64de5de1193d"},"schema_version":"1.0","source":{"id":"1208.0105","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.0105","created_at":"2026-05-18T01:56:00Z"},{"alias_kind":"arxiv_version","alias_value":"1208.0105v1","created_at":"2026-05-18T01:56:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.0105","created_at":"2026-05-18T01:56:00Z"},{"alias_kind":"pith_short_12","alias_value":"LGOYDSNH2XUF","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"LGOYDSNH2XUFUDPR","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"LGOYDSNH","created_at":"2026-05-18T12:27:14Z"}],"graph_snapshots":[{"event_id":"sha256:62bf28ca9752abcaba9eec3a3048bf62ba488148d6b92f4ff2a7db4d14ddad13","target":"graph","created_at":"2026-05-18T01:56:00Z","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 propose a nonlocal entanglement concentration protocol (ECP) for $N$-photon systems in a partially entangled W state, resorting to some ancillary single photons and the parity-check measurement based on cross-Kerr nonlinearity. One party in quantum communication first performs a parity-check measurement on her photon in an $N$-photon system and an ancillary photon, and then she picks up the even-parity instance for obtaining the standard W state. When she obtains an odd-parity instance, the system is in a less-entanglement state and it is the resource in the next round of entanglement conce","authors_text":"Bao-Cang Ren, Fang-Fang Du, Fu-Guo Deng, Hai-Rui Wei, Tao Li","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-08-01T04:56:17Z","title":"Single-photon-assisted entanglement concentration of a multi-photon system in a partially entangled W state with weak cross-Kerr nonlinearity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.0105","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":"sha256:7839b36ca8bfcdc29b1326e957af7f305753ce6526df7c2c220dc76f157e1d00","target":"record","created_at":"2026-05-18T01:56:00Z","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":"a77fa5bc6d695c1f65f5a2ada4322c4a865923f1e19de4d73215e482ca5955ac","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-08-01T04:56:17Z","title_canon_sha256":"1328a161c3ba57cba2eba697dfcd0c3ddc004162b8c652a60d0c64de5de1193d"},"schema_version":"1.0","source":{"id":"1208.0105","kind":"arxiv","version":1}},"canonical_sha256":"599d81c9a7d5e85a0df1f3a9aa373ef73397d03ebca81400e9872f88150a3765","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"599d81c9a7d5e85a0df1f3a9aa373ef73397d03ebca81400e9872f88150a3765","first_computed_at":"2026-05-18T01:56:00.354736Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:56:00.354736Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"71/MiagQT/e/e+VNbwA0yRI+Z4i68FoeWfS/HtMaPzxRJAsxd6EhxpAayXwPO+jyxlmWtEjYDXOVt+7SXeORCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:56:00.355147Z","signed_message":"canonical_sha256_bytes"},"source_id":"1208.0105","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7839b36ca8bfcdc29b1326e957af7f305753ce6526df7c2c220dc76f157e1d00","sha256:62bf28ca9752abcaba9eec3a3048bf62ba488148d6b92f4ff2a7db4d14ddad13"],"state_sha256":"b8177fa85d0817218e35706910d3607ea78753da929187c4314a175c8ca4f058"}