{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:CXMFS4BQ6K2MLS73S5XGSHQ7FZ","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":"59eb58c14cd75465a4dff8667ea4722e765b22f057f29db9f9928e6c74ff3a1f","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-05-21T17:56:44Z","title_canon_sha256":"8f7c13492f3ee7a8fe9ab7e11fa34f4abe3a71b36b8b8e64c2f966a4680fb314"},"schema_version":"1.0","source":{"id":"2605.22807","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.22807","created_at":"2026-05-22T02:04:55Z"},{"alias_kind":"arxiv_version","alias_value":"2605.22807v1","created_at":"2026-05-22T02:04:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.22807","created_at":"2026-05-22T02:04:55Z"},{"alias_kind":"pith_short_12","alias_value":"CXMFS4BQ6K2M","created_at":"2026-05-22T02:04:55Z"},{"alias_kind":"pith_short_16","alias_value":"CXMFS4BQ6K2MLS73","created_at":"2026-05-22T02:04:55Z"},{"alias_kind":"pith_short_8","alias_value":"CXMFS4BQ","created_at":"2026-05-22T02:04:55Z"}],"graph_snapshots":[{"event_id":"sha256:ec6b41100a310491ed76598b2d956d5c458ec590109091c596faf41fc585a49e","target":"graph","created_at":"2026-05-22T02:04:55Z","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/2605.22807/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Quantum processes with indefinite causal order -- so-called causally nonseparable processes -- can exhibit various advantages over quantum circuits with a fixed or a well-defined causal structure. A natural question is how much nonclassicality is required for a process to display causal nonseparability. Here we address this by investigating how many systems can be dephased (or decohered) before this property vanishes. First, for bipartite processes with open past and future we show that if all systems are dephased, or if only the future system is kept undephased, then the process becomes causa","authors_text":"Cyril Branciard, Kuntal Sengupta, Yassine Benhaj","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-05-21T17:56:44Z","title":"How many systems can be dephased before the quantum switch becomes causally definite?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.22807","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":"sha256:3dd05170b8c8b41b175fa8871fdd87da4b04ceae06a7ec96fee5de3d2c21bdd6","target":"record","created_at":"2026-05-22T02:04:55Z","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":"59eb58c14cd75465a4dff8667ea4722e765b22f057f29db9f9928e6c74ff3a1f","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"quant-ph","submitted_at":"2026-05-21T17:56:44Z","title_canon_sha256":"8f7c13492f3ee7a8fe9ab7e11fa34f4abe3a71b36b8b8e64c2f966a4680fb314"},"schema_version":"1.0","source":{"id":"2605.22807","kind":"arxiv","version":1}},"canonical_sha256":"15d8597030f2b4c5cbfb976e691e1f2e682e134f6f4fb66b6d461ae41f63de81","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"15d8597030f2b4c5cbfb976e691e1f2e682e134f6f4fb66b6d461ae41f63de81","first_computed_at":"2026-05-22T02:04:55.687951Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-22T02:04:55.687951Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QAFyHO6J6pxirOpKaymX1GxJF1MdxQ/BvM/+4Oq6XGqVORI+xTyCaSsquxg4EInWcvn3qVAxG8FTchSKfM4BBQ==","signature_status":"signed_v1","signed_at":"2026-05-22T02:04:55.688488Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.22807","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3dd05170b8c8b41b175fa8871fdd87da4b04ceae06a7ec96fee5de3d2c21bdd6","sha256:ec6b41100a310491ed76598b2d956d5c458ec590109091c596faf41fc585a49e"],"state_sha256":"328a0777ffe149e3ba585bd96ad222d669180fddef56b2321cd6a616992f1156"}