{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"13438ef8157f792d090ca9a521442d1c399abcff10b2d5a13974583babf50eea","created":"2026-10-03T07:18:09Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"eea9a61e3d503294b2d7d01644422731bb7e32ee5b86e8b156d4c08db1a60a09","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"qi.causal-order-qrf.temporal-order-bell","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"If a heavy mass is in a superposition of two positions, nearby clocks tick at superposed rates, which can put the order of two events in superposition. A proposed Bell-type test would show this order is not fixed in advance by hidden variables.","posed_since":"2019","precise":"Zych, Costa, Pikovski and Brukner (Nature Communications 2019) proposed a Bell-type inequality for the temporal order of events controlled by a massive body in spatial superposition. Using the weak-field proper-time difference $\\Delta \\tau \\sim G M \\Delta x t / (c^{2} d^{2})$, determine the minimal mass, separation and coherence time for a violation, and demonstrate it.","problem_ref":null,"references":"","settled_by":"Observation of the predicted violation with a source mass in spatial superposition.","status_note":"","title":"Bell test for temporal order using a mass in superposition","topic_ref":"0d56bf5e6184723e4f024030c3c79a9dde6f6fca1514c152e520bdf56cfb78be"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"f61a44ac8ac7b8340dbf350bd4ab29895ebe231cf66592e585147c745d87e7d4","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"bf53532cd8aa00c42830605cc1ec3f28d08fe48caa410f95f75b090015532551","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"meVH6CBniu7bbI1IHTb_wyNvxkPT9MX3lHwidXpU7kTwvNvTxdsAh3HfXDguTniTL_8q0a6vXBUthSzBv5lvDQ"},"schema":"pubphys.envelope/1"},"record_hash":"f61a44ac8ac7b8340dbf350bd4ab29895ebe231cf66592e585147c745d87e7d4","leaf_index":1970}