{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:SBLAKVGCN2KCCNHDI2WQXMKNPS","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":"88bfa317b6e773a161234614e2bde687cfaeea4610ec3386c26b9abd932b75ef","cross_cats_sorted":["cond-mat.quant-gas","cond-mat.stat-mech"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-10-30T17:14:52Z","title_canon_sha256":"8f195a0cd415ab92ee0e08a8f8da8d033093e64d4626b75fa0b3859c8eeaff59"},"schema_version":"1.0","source":{"id":"1810.12869","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.12869","created_at":"2026-07-05T00:48:58Z"},{"alias_kind":"arxiv_version","alias_value":"1810.12869v3","created_at":"2026-07-05T00:48:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.12869","created_at":"2026-07-05T00:48:58Z"},{"alias_kind":"pith_short_12","alias_value":"SBLAKVGCN2KC","created_at":"2026-07-05T00:48:58Z"},{"alias_kind":"pith_short_16","alias_value":"SBLAKVGCN2KCCNHD","created_at":"2026-07-05T00:48:58Z"},{"alias_kind":"pith_short_8","alias_value":"SBLAKVGC","created_at":"2026-07-05T00:48:58Z"}],"graph_snapshots":[{"event_id":"sha256:ae711284621b97858eebe7740343dd5b757e90bb634a27f3ba284b6401db4555","target":"graph","created_at":"2026-07-05T00:48:58Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1810.12869/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We propose a time-of-arrival operator in quantum mechanics by conditioning on a quantum clock. This allows us to bypass some of the problems of previous proposals, and to obtain a Hermitian time of arrival operator whose probability distribution arises from the Born rule and which has a clear physical interpretation. The same procedure can be employed to measure the \"time at which some event happens\" for arbitrary events (and not just specifically for the arrival time of a particle).","authors_text":"Krzysztof Sacha, Lorenzo Maccone","cross_cats":["cond-mat.quant-gas","cond-mat.stat-mech"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-10-30T17:14:52Z","title":"Quantum measurements of time"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.12869","kind":"arxiv","version":3},"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":"sha256:8e524a514afd398baab7044832c4e78b2dbc9ddf1a2cdda20560307fefc4544b","target":"record","created_at":"2026-07-05T00:48:58Z","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":"88bfa317b6e773a161234614e2bde687cfaeea4610ec3386c26b9abd932b75ef","cross_cats_sorted":["cond-mat.quant-gas","cond-mat.stat-mech"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2018-10-30T17:14:52Z","title_canon_sha256":"8f195a0cd415ab92ee0e08a8f8da8d033093e64d4626b75fa0b3859c8eeaff59"},"schema_version":"1.0","source":{"id":"1810.12869","kind":"arxiv","version":3}},"canonical_sha256":"90560554c26e942134e346ad0bb14d7cb8a68086cfb3805e77bd2f4289e2e0b9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"90560554c26e942134e346ad0bb14d7cb8a68086cfb3805e77bd2f4289e2e0b9","first_computed_at":"2026-07-05T00:48:58.290522Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:48:58.290522Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"o7yHwuJciUAn1Tkq11i7eP23PzQD9KhwRvZmRU3GR5t1E7/etF8WnsoQH4I+GuU3A0/PA7qGc78VgzVlThiTDw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:48:58.291073Z","signed_message":"canonical_sha256_bytes"},"source_id":"1810.12869","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8e524a514afd398baab7044832c4e78b2dbc9ddf1a2cdda20560307fefc4544b","sha256:ae711284621b97858eebe7740343dd5b757e90bb634a27f3ba284b6401db4555"],"state_sha256":"f401ca2007cac41837b45ae33ee5a7d0a65327467b17506b4e1ce3e54f9bb747"}