{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:PBRGXH7DM3AEDOPYUL4CGZDALB","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":"eea3bfb2ae8e0b95a78ebb72def6f5c782449fd2320ee54846da6e6c9b5f59ef","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-10-25T16:54:47Z","title_canon_sha256":"261280961387b6b32c7c381a40e112d3b97f3d7c41f9c9f2551b849a9f8529f8"},"schema_version":"1.0","source":{"id":"1810.10976","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.10976","created_at":"2026-05-17T23:54:43Z"},{"alias_kind":"arxiv_version","alias_value":"1810.10976v1","created_at":"2026-05-17T23:54:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.10976","created_at":"2026-05-17T23:54:43Z"},{"alias_kind":"pith_short_12","alias_value":"PBRGXH7DM3AE","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_16","alias_value":"PBRGXH7DM3AEDOPY","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_8","alias_value":"PBRGXH7D","created_at":"2026-05-18T12:32:43Z"}],"graph_snapshots":[{"event_id":"sha256:3ab4083586a3268655b3aff792401858c09978678be8bfd8841ab8ab915ba184","target":"graph","created_at":"2026-05-17T23:54:43Z","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":"The arrival time problem for the free particle in one dimension may be formulated as the problem of determining a joint probability for the particle being found on opposite sides of the $x$-axis at two different times. We explore this problem using a two-time quasi-probability linear in the projection operators, a natural counterpart of the corresponding classical problem. We show that it can be measured either indirectly, by measuring its moments in different experiments, or directly, in a single experiment using a pair of sequential measurements in which the first measurement is weak (or mor","authors_text":"B.K.B.Lee, H.Beck, J.J.Halliwell, S.O'Brien","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-10-25T16:54:47Z","title":"A quasi-probability for the arrival time problem with links to backflow and the Leggett-Garg inequalities"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.10976","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":"sha256:6197b949eeb6906dca69478cfe9ef6f633150686b5f9eddb866e5991fa3f6504","target":"record","created_at":"2026-05-17T23:54:43Z","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":"eea3bfb2ae8e0b95a78ebb72def6f5c782449fd2320ee54846da6e6c9b5f59ef","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-10-25T16:54:47Z","title_canon_sha256":"261280961387b6b32c7c381a40e112d3b97f3d7c41f9c9f2551b849a9f8529f8"},"schema_version":"1.0","source":{"id":"1810.10976","kind":"arxiv","version":1}},"canonical_sha256":"78626b9fe366c041b9f8a2f8236460584d69fad5c70521a664e957a7531f28b2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"78626b9fe366c041b9f8a2f8236460584d69fad5c70521a664e957a7531f28b2","first_computed_at":"2026-05-17T23:54:43.051418Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:54:43.051418Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TgHeBpz34jaxjmQNlAWCC86WUBBgBM5WjVNIb6z7q/6KeeQ537GtYDzH7M76idFfDkEXTzbjlCnk6qu1CXcCCA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:54:43.051945Z","signed_message":"canonical_sha256_bytes"},"source_id":"1810.10976","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6197b949eeb6906dca69478cfe9ef6f633150686b5f9eddb866e5991fa3f6504","sha256:3ab4083586a3268655b3aff792401858c09978678be8bfd8841ab8ab915ba184"],"state_sha256":"5ed8239625cdbd61d5e0098534406875ca1c01840894b62afd783bf73542fbbb"}