{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"32eba0ae4bc5fdf90b94d647e440bfbf4eef0bdb8939ed7683f5d0789b851aab","created":"2026-10-03T07:18:10Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","d9dadf12fa562161eb432c8b64e7061083dfb942021a2157fafae9f3892fcf38"],"salt":"096523f35c6a453189c0b01c10b1c2e1e9ad739b26503d4576a2f8023ec894fa","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"qi.quantum-principles.ic-almost-quantum","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"d9dadf12fa562161eb432c8b64e7061083dfb942021a2157fafae9f3892fcf38","relation":"special_case"}],"plain":"The almost-quantum set is a slightly larger family than the quantum correlations that obeys nearly every principle proposed so far. If it also obeys information causality, that principle cannot single out quantum theory.","posed_since":"2015","precise":"Determine whether every behavior in the almost-quantum set (level 1+AB of the Navascues-Pironio-Acin hierarchy, Navascues et al., Nature Communications 2015) satisfies information causality, in its original form and its generalized correlated-input form, for any number of copies and any wiring. An answer is a proof or an explicit almost-quantum box with a violating protocol.","problem_ref":null,"references":"","settled_by":"A proof that the almost-quantum set obeys information causality, or an almost-quantum box with an information-causality-violating protocol.","status_note":"Stated as unresolved in arXiv:2609.10508 (September 2026).","title":"Do almost-quantum correlations satisfy information causality?","topic_ref":"26891b8e1768832b53e0431c42eec2be3991112a72dbe42379ae527cbe11ff25"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"58082a9993ea315ad5029c4c71da4d183f09974351780a6f880759b06fe6dded","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"0ea5913a05e1a92f829c63b21d51d4c8f6655d74fc882ec583ff4d7c0a51966a","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"djuhU--7ghk_4KkdHSLWwrKdGefISe4mxpPrlyBs_R_vfu3OqwxN58QiBEgtCQ765-e0qnOmaoThQ6C9hqNbAQ"},"schema":"pubphys.envelope/1"},"record_hash":"58082a9993ea315ad5029c4c71da4d183f09974351780a6f880759b06fe6dded","leaf_index":2032}