{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:S7WOZ5WEV4KPQSOL7PVPS5Q2RA","short_pith_number":"pith:S7WOZ5WE","canonical_record":{"source":{"id":"1907.05607","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-07-12T08:09:44Z","cross_cats_sorted":[],"title_canon_sha256":"e9cbfec5ebc47033f747ada3b7cc4edf3334786d62a0d6094c512d45c81796d5","abstract_canon_sha256":"842460801f4dd97dca9ed77733f04a9a50e027fa046cc22fabfdb459b9005596"},"schema_version":"1.0"},"canonical_sha256":"97ececf6c4af14f849cbfbeaf9761a883b6688115c7fc7059ea8329c07b2037e","source":{"kind":"arxiv","id":"1907.05607","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.05607","created_at":"2026-07-05T05:51:22Z"},{"alias_kind":"arxiv_version","alias_value":"1907.05607v4","created_at":"2026-07-05T05:51:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.05607","created_at":"2026-07-05T05:51:22Z"},{"alias_kind":"pith_short_12","alias_value":"S7WOZ5WEV4KP","created_at":"2026-07-05T05:51:22Z"},{"alias_kind":"pith_short_16","alias_value":"S7WOZ5WEV4KPQSOL","created_at":"2026-07-05T05:51:22Z"},{"alias_kind":"pith_short_8","alias_value":"S7WOZ5WE","created_at":"2026-07-05T05:51:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:S7WOZ5WEV4KPQSOL7PVPS5Q2RA","target":"record","payload":{"canonical_record":{"source":{"id":"1907.05607","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-07-12T08:09:44Z","cross_cats_sorted":[],"title_canon_sha256":"e9cbfec5ebc47033f747ada3b7cc4edf3334786d62a0d6094c512d45c81796d5","abstract_canon_sha256":"842460801f4dd97dca9ed77733f04a9a50e027fa046cc22fabfdb459b9005596"},"schema_version":"1.0"},"canonical_sha256":"97ececf6c4af14f849cbfbeaf9761a883b6688115c7fc7059ea8329c07b2037e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:51:22.973824Z","signature_b64":"vTtY8ROZ1D1tnF+9bNI95JvTr316ysfi2kIZsg7rI7aodvnWACmgzgcWkqt86wFqfVVYTGkwOcsQGmW/9kXTBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"97ececf6c4af14f849cbfbeaf9761a883b6688115c7fc7059ea8329c07b2037e","last_reissued_at":"2026-07-05T05:51:22.973406Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:51:22.973406Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1907.05607","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T05:51:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LE18SlW0mzLh6rzGGogz/OlAfpf/L3gljbcMHgwX98ufN4Q2Lpb0qQ2CY0cPPoswpayBp95+QJlLPC2ISUsTAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T02:45:12.661326Z"},"content_sha256":"10b6b25c21525b556ccc0a4ca5e000cbe200262ab51fff35735357927dc28b16","schema_version":"1.0","event_id":"sha256:10b6b25c21525b556ccc0a4ca5e000cbe200262ab51fff35735357927dc28b16"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:S7WOZ5WEV4KPQSOL7PVPS5Q2RA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A strong no-go theorem on the Wigner's friend paradox","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"quant-ph","authors_text":"An\\'ibal Utreras-Alarc\\'on, Eric G. Cavalcanti, Farzad Ghafari, Geoff J. Pryde, Howard M. Wiseman, Kok-Wei Bong, Nora Tischler, Yeong-Cherng Liang","submitted_at":"2019-07-12T08:09:44Z","abstract_excerpt":"Does quantum theory apply at all scales, including that of observers? New light on this fundamental question has recently been shed through a resurgence of interest in the long-standing Wigner's friend paradox. This is a thought experiment addressing the quantum measurement problem -- the difficulty of reconciling the (unitary, deterministic) evolution of isolated systems and the (non-unitary, probabilistic) state update after a measurement. Here, by building on a scenario with two separated but entangled friends introduced by Brukner, we prove that if quantum evolution is controllable on the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.05607","kind":"arxiv","version":4},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1907.05607/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T05:51:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jyg6KXogCO0uvrOn5JIcPOwNYetpkNj8icek/kMv21Ws43Ebdanfj+VX1YuNPS918x7WTvqPPh3rvE5tgRvBCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T02:45:12.661823Z"},"content_sha256":"b1c26bad6858c5f2cab9f7b310e08db2e18e300a0c4ba1ded24441200d602ffb","schema_version":"1.0","event_id":"sha256:b1c26bad6858c5f2cab9f7b310e08db2e18e300a0c4ba1ded24441200d602ffb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/S7WOZ5WEV4KPQSOL7PVPS5Q2RA/bundle.json","state_url":"https://pith.science/pith/S7WOZ5WEV4KPQSOL7PVPS5Q2RA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/S7WOZ5WEV4KPQSOL7PVPS5Q2RA/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-04T02:45:12Z","links":{"resolver":"https://pith.science/pith/S7WOZ5WEV4KPQSOL7PVPS5Q2RA","bundle":"https://pith.science/pith/S7WOZ5WEV4KPQSOL7PVPS5Q2RA/bundle.json","state":"https://pith.science/pith/S7WOZ5WEV4KPQSOL7PVPS5Q2RA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/S7WOZ5WEV4KPQSOL7PVPS5Q2RA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:S7WOZ5WEV4KPQSOL7PVPS5Q2RA","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":"842460801f4dd97dca9ed77733f04a9a50e027fa046cc22fabfdb459b9005596","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-07-12T08:09:44Z","title_canon_sha256":"e9cbfec5ebc47033f747ada3b7cc4edf3334786d62a0d6094c512d45c81796d5"},"schema_version":"1.0","source":{"id":"1907.05607","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.05607","created_at":"2026-07-05T05:51:22Z"},{"alias_kind":"arxiv_version","alias_value":"1907.05607v4","created_at":"2026-07-05T05:51:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.05607","created_at":"2026-07-05T05:51:22Z"},{"alias_kind":"pith_short_12","alias_value":"S7WOZ5WEV4KP","created_at":"2026-07-05T05:51:22Z"},{"alias_kind":"pith_short_16","alias_value":"S7WOZ5WEV4KPQSOL","created_at":"2026-07-05T05:51:22Z"},{"alias_kind":"pith_short_8","alias_value":"S7WOZ5WE","created_at":"2026-07-05T05:51:22Z"}],"graph_snapshots":[{"event_id":"sha256:b1c26bad6858c5f2cab9f7b310e08db2e18e300a0c4ba1ded24441200d602ffb","target":"graph","created_at":"2026-07-05T05:51:22Z","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/1907.05607/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Does quantum theory apply at all scales, including that of observers? New light on this fundamental question has recently been shed through a resurgence of interest in the long-standing Wigner's friend paradox. This is a thought experiment addressing the quantum measurement problem -- the difficulty of reconciling the (unitary, deterministic) evolution of isolated systems and the (non-unitary, probabilistic) state update after a measurement. Here, by building on a scenario with two separated but entangled friends introduced by Brukner, we prove that if quantum evolution is controllable on the ","authors_text":"An\\'ibal Utreras-Alarc\\'on, Eric G. Cavalcanti, Farzad Ghafari, Geoff J. Pryde, Howard M. Wiseman, Kok-Wei Bong, Nora Tischler, Yeong-Cherng Liang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-07-12T08:09:44Z","title":"A strong no-go theorem on the Wigner's friend paradox"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.05607","kind":"arxiv","version":4},"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":"sha256:10b6b25c21525b556ccc0a4ca5e000cbe200262ab51fff35735357927dc28b16","target":"record","created_at":"2026-07-05T05:51:22Z","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":"842460801f4dd97dca9ed77733f04a9a50e027fa046cc22fabfdb459b9005596","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2019-07-12T08:09:44Z","title_canon_sha256":"e9cbfec5ebc47033f747ada3b7cc4edf3334786d62a0d6094c512d45c81796d5"},"schema_version":"1.0","source":{"id":"1907.05607","kind":"arxiv","version":4}},"canonical_sha256":"97ececf6c4af14f849cbfbeaf9761a883b6688115c7fc7059ea8329c07b2037e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"97ececf6c4af14f849cbfbeaf9761a883b6688115c7fc7059ea8329c07b2037e","first_computed_at":"2026-07-05T05:51:22.973406Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:51:22.973406Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vTtY8ROZ1D1tnF+9bNI95JvTr316ysfi2kIZsg7rI7aodvnWACmgzgcWkqt86wFqfVVYTGkwOcsQGmW/9kXTBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T05:51:22.973824Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.05607","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:10b6b25c21525b556ccc0a4ca5e000cbe200262ab51fff35735357927dc28b16","sha256:b1c26bad6858c5f2cab9f7b310e08db2e18e300a0c4ba1ded24441200d602ffb"],"state_sha256":"6fd922d8428789882a5e722f74454a25d2494d6f75e6bb7ee8c937fa5ac168c3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"77hK35epf02AD/JLW/LCpZIwXMm+PmEttJHlXGMxPVwgnY1aGDxZ0AgaRS+umMSJ60fxNIYTvdI70gAYUsISCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T02:45:12.665910Z","bundle_sha256":"68e596fd9ddd99c0314633b6354f281b73045609c3503a62fb41ff15a7a90577"}}