{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:ATJ25QIFIHHSBWIZJVOKZCFT2V","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":"3b7b498af61cba82b7615956d1710a11756867a2432c8b5c82aa33352e87ccb8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-06-02T11:36:48Z","title_canon_sha256":"978d463ef7cb485e2f228a23b312d6930ef2856db0b814077157d3b29c4b9c45"},"schema_version":"1.0","source":{"id":"1106.0405","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1106.0405","created_at":"2026-05-18T02:01:44Z"},{"alias_kind":"arxiv_version","alias_value":"1106.0405v2","created_at":"2026-05-18T02:01:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1106.0405","created_at":"2026-05-18T02:01:44Z"},{"alias_kind":"pith_short_12","alias_value":"ATJ25QIFIHHS","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_16","alias_value":"ATJ25QIFIHHSBWIZ","created_at":"2026-05-18T12:26:24Z"},{"alias_kind":"pith_short_8","alias_value":"ATJ25QIF","created_at":"2026-05-18T12:26:24Z"}],"graph_snapshots":[{"event_id":"sha256:18da8be759c933ddee56615d3a379b871dbafb02f2f1f762379f3cb4d52b1507","target":"graph","created_at":"2026-05-18T02:01:44Z","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":"In analogy with the usual state estimation problem, we introduce the problem of state estimation for a pre- and post-selected ensemble. The problem has fundamental physical significance since, as argued by Y. Aharonov and collaborators, pre- and post-selected ensembles are the most basic quantum ensembles. Two new features are shown to appear: 1) information is flowing to the measuring device both from the past and from the future; 2)because of the post-selection, certain measurement outcomes can be forced never to occur. Due to these features, state estimation in such ensembles is dramaticall","authors_text":"Sandu Popescu, Serge Massar","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-06-02T11:36:48Z","title":"Estimating Pre- and Post-Selected Ensembles"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1106.0405","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":"sha256:31fe9d2ed478a4a117066e806a489386580a1000b4e697ed0c7cfd6baa51fd3d","target":"record","created_at":"2026-05-18T02:01:44Z","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":"3b7b498af61cba82b7615956d1710a11756867a2432c8b5c82aa33352e87ccb8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2011-06-02T11:36:48Z","title_canon_sha256":"978d463ef7cb485e2f228a23b312d6930ef2856db0b814077157d3b29c4b9c45"},"schema_version":"1.0","source":{"id":"1106.0405","kind":"arxiv","version":2}},"canonical_sha256":"04d3aec10541cf20d9194d5cac88b3d57ca1627fa93b212a3462c6dd8b724c0e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"04d3aec10541cf20d9194d5cac88b3d57ca1627fa93b212a3462c6dd8b724c0e","first_computed_at":"2026-05-18T02:01:44.375874Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:01:44.375874Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"T2Su8XygC8aT2qlqByierOXyUkFCaU3cnBWIBRLisfJ0fnnAFEr/EEedHyAyE+uWYa0zQtJzWzRzzWrHOS9FBw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:01:44.376566Z","signed_message":"canonical_sha256_bytes"},"source_id":"1106.0405","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:31fe9d2ed478a4a117066e806a489386580a1000b4e697ed0c7cfd6baa51fd3d","sha256:18da8be759c933ddee56615d3a379b871dbafb02f2f1f762379f3cb4d52b1507"],"state_sha256":"8f41c73ef8748f3bc17c2c4601931e90966cf919eae598c89226b4b59df92eaa"}