{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"2b38bf4e0765c894142c102aa7706a9e7423b691a583163eda1f897dd90155a6","created":"2026-10-03T07:18:10Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"d390d641ee70cff987f75d1bd98e43a0f8e886920114dcdec3dde42769160b6f","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"qi.quantum-principles.quantum-set-principle","kind":"phenomenon","literature_status":"open","n":"1","parents":[],"plain":"No-signalling allows superstrong correlations, such as the Popescu-Rohrlich box, that quantum mechanics forbids. Proposed principles remove many of them, but none so far gives exactly the quantum set.","posed_since":"1994","precise":"Find a physical or information-theoretic principle $P$, stated without Hilbert space, such that the set of bipartite and multipartite behaviors $p(ab...\\mid xy...)$ satisfying $P$, closed under wirings and composition, equals the quantum set $Q$ or its closure. Known principles (non-trivial communication complexity, information causality, macroscopic locality, local orthogonality) are either satisfied by the almost-quantum set, which strictly contains $Q$, or not known to exclude it.","problem_ref":null,"references":"","settled_by":"A principle with proofs that Q satisfies it and every non-quantum behavior violates it.","status_note":"Gallego et al. (2011) showed that bipartite principles alone cannot recover multipartite quantum correlations.","title":"Which principle singles out exactly the quantum correlations?","topic_ref":"26891b8e1768832b53e0431c42eec2be3991112a72dbe42379ae527cbe11ff25"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"d9dadf12fa562161eb432c8b64e7061083dfb942021a2157fafae9f3892fcf38","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"eca38525c46dcc4ceff7143e3a30cf2cec8380f7326e5be48587114db652bb82","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"Dexj2IUDWzaugRY8vBHwX1d8cUcmTnXIN9qZlvB644ZTwbrdf4vL3gnuyY9MrDXdj2lf65lXCuUXONsMm36UBg"},"schema":"pubphys.envelope/1"},"record_hash":"d9dadf12fa562161eb432c8b64e7061083dfb942021a2157fafae9f3892fcf38","leaf_index":2031}