{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"08726f498baf0d3c3aba0c18437b6f49ef90e52d2c2a3074279b7bcd5e88b300","created":"2026-10-03T07:17:59Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"4017b319986dd2cb982b8185e3a23cd17e3801228680b41e7aa23238ab18d20b","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.dqpt.local-observable-signature","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"The return probability shrinks exponentially with system size, so it cannot be measured in big systems. The question is whether some quantity measured on a few sites shows the same sharp kinks.","posed_since":"","precise":"For interacting lattice systems with $N\\to \\infty$, is there a local or few-body observable, or a measurable distribution such as the full counting statistics of the order parameter, whose time dependence is nonanalytic exactly at the DQPT times $t_c$? Answer yes or no, with a construction.","problem_ref":null,"references":"","settled_by":"A proof or explicit construction in an interacting nonintegrable model, demonstrated in a quantum simulator with more than about 50 sites.","status_note":"","title":"Can a local measurement detect a dynamical transition in large systems","topic_ref":"f0f2c6f7bdd6262d6700dc8806ab5f70f58e1999b1e12bad11c2bf274d3c1f12"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"166b22b14c9e361884742967c062331ab5c36bf173230376e2e35e39dea54931","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"635755daca00456ca85a35cc642614f5a3b8e5b65969fe0d1b33d50be63b2ac7","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"pdw4zLjRRq80zmy6tB4BGL0rNbSoEc-8y3jZdVkn9Deqyu08gY2NhMr31JSuBASRI6wtT2zGVHuj-PsbHmpBDw"},"schema":"pubphys.envelope/1"},"record_hash":"166b22b14c9e361884742967c062331ab5c36bf173230376e2e35e39dea54931","leaf_index":953}