{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:UYY2ZBBATNE4YISMM2MGWF5RYP","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":"06c4ef8d87c1c36056676fc6fef36aacfcd407e4eab6e77a7a32b5c5e8e7e66f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-10-14T11:21:34Z","title_canon_sha256":"25f0cfb923bdb585c9ca9d5981b0e057b0d773d3c5219b25c1c21a90ed3601d7"},"schema_version":"1.0","source":{"id":"1010.2878","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1010.2878","created_at":"2026-05-18T03:20:57Z"},{"alias_kind":"arxiv_version","alias_value":"1010.2878v2","created_at":"2026-05-18T03:20:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1010.2878","created_at":"2026-05-18T03:20:57Z"},{"alias_kind":"pith_short_12","alias_value":"UYY2ZBBATNE4","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_16","alias_value":"UYY2ZBBATNE4YISM","created_at":"2026-05-18T12:26:15Z"},{"alias_kind":"pith_short_8","alias_value":"UYY2ZBBA","created_at":"2026-05-18T12:26:15Z"}],"graph_snapshots":[{"event_id":"sha256:5978a520b410b2a002139a6af88b9fc34faec01824cbc600c82b2d6be299fcd9","target":"graph","created_at":"2026-05-18T03:20:57Z","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 consider joint measurement of two and three unsharp qubit observables through an Arthur-Kelly type joint measurement model for qubits. We investigate the effect of initial state of the detectors on the unsharpness of the measurement as well as the post-measurement state of the system. Particular emphasis is given on a physical understanding of the POVM to PVM transition in the model and entanglement between system and detectors.Two approaches for characterizing the unsharpness of the measurement and the resulting measurement uncertainty relations are considered.The corresponding measures of","authors_text":"Rajarshi Pal, Sibasish Ghosh","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-10-14T11:21:34Z","title":"Approximate joint measurement of qubit observables through an Arthur-Kelly type model"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1010.2878","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:e577cdaaf0768c6e4df8342af26e6cba5b12fc2ada819a7e76039aad8044bc65","target":"record","created_at":"2026-05-18T03:20:57Z","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":"06c4ef8d87c1c36056676fc6fef36aacfcd407e4eab6e77a7a32b5c5e8e7e66f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2010-10-14T11:21:34Z","title_canon_sha256":"25f0cfb923bdb585c9ca9d5981b0e057b0d773d3c5219b25c1c21a90ed3601d7"},"schema_version":"1.0","source":{"id":"1010.2878","kind":"arxiv","version":2}},"canonical_sha256":"a631ac84209b49cc224c66986b17b1c3d5686dce66726b711ced39bf6d90241f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a631ac84209b49cc224c66986b17b1c3d5686dce66726b711ced39bf6d90241f","first_computed_at":"2026-05-18T03:20:57.343300Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:20:57.343300Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bAdd3CEFlDI/ot/bh6JUc2BEkG3mfVTXSvb9yByynt4taxeAufWlfXpKVe6QVLSiY0Q3jjooaIzSt6dWKE6oAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:20:57.343965Z","signed_message":"canonical_sha256_bytes"},"source_id":"1010.2878","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e577cdaaf0768c6e4df8342af26e6cba5b12fc2ada819a7e76039aad8044bc65","sha256:5978a520b410b2a002139a6af88b9fc34faec01824cbc600c82b2d6be299fcd9"],"state_sha256":"84a86432f18012d30baf7e915f629cca863d46c039054ac0eeebbb5de963508a"}