{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:BCT4WGP5PKAARVRRAZCRDNOCFH","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":"0c74a379cf6fcb43d9eee6a07fdca2a215b08f62b463c7b62ccbdf23bc56b564","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-12-19T15:22:16Z","title_canon_sha256":"27ef0305621a5f5b11f005c9648d2716d3a175b2a51d1a4bc37528e54481a7ef"},"schema_version":"1.0","source":{"id":"1212.4704","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1212.4704","created_at":"2026-05-18T03:29:15Z"},{"alias_kind":"arxiv_version","alias_value":"1212.4704v2","created_at":"2026-05-18T03:29:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1212.4704","created_at":"2026-05-18T03:29:15Z"},{"alias_kind":"pith_short_12","alias_value":"BCT4WGP5PKAA","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"BCT4WGP5PKAARVRR","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"BCT4WGP5","created_at":"2026-05-18T12:26:58Z"}],"graph_snapshots":[{"event_id":"sha256:4a461207a521175e7dbbea34199ea148868dd6d4ea73996744c0c5982a121724","target":"graph","created_at":"2026-05-18T03:29:15Z","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 introduce a quantum cellular automaton that achieves approximate phase-covariant cloning of qubits. The automaton is optimized for 1-to-2N economical cloning. The use of the automaton for cloning allows us to exploit different foliations for improving the performance with given resources.","authors_text":"C. Macchiavello, G. M. D'Ariano, M. Rossi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-12-19T15:22:16Z","title":"Quantum Cloning by Cellular Automata"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1212.4704","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:e17f32951105f9b52bb26c4f070e548d5eb449684c9eb91d8f23a149c25b0867","target":"record","created_at":"2026-05-18T03:29:15Z","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":"0c74a379cf6fcb43d9eee6a07fdca2a215b08f62b463c7b62ccbdf23bc56b564","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2012-12-19T15:22:16Z","title_canon_sha256":"27ef0305621a5f5b11f005c9648d2716d3a175b2a51d1a4bc37528e54481a7ef"},"schema_version":"1.0","source":{"id":"1212.4704","kind":"arxiv","version":2}},"canonical_sha256":"08a7cb19fd7a8008d631064511b5c229cc3b57e7d655cf7d5af25dd49d01c047","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"08a7cb19fd7a8008d631064511b5c229cc3b57e7d655cf7d5af25dd49d01c047","first_computed_at":"2026-05-18T03:29:15.835624Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:29:15.835624Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dP2hM4QSeZJTcptmwPj+tD8MqsOtaPMLd7aE/ze1fekNbMdzT5BSKryMx5JgBzgYBu5mNq4zOzuUoPqLNOHhDw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:29:15.836527Z","signed_message":"canonical_sha256_bytes"},"source_id":"1212.4704","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e17f32951105f9b52bb26c4f070e548d5eb449684c9eb91d8f23a149c25b0867","sha256:4a461207a521175e7dbbea34199ea148868dd6d4ea73996744c0c5982a121724"],"state_sha256":"2d41e14ef3350b76cadb5e4a01d19d29bb93661377adde57ec31e85faa97d08b"}