{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"81a17bf0d716ecab779e27ad56573a1cbbf11c04a53767009414f00295db5e21","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["166b22b14c9e361884742967c062331ab5c36bf173230376e2e35e39dea54931","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"ce764bdc81c9fa795c44b4767aa54a60f8c962bd6bde52a1a528412fa98ff448","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":"2","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":"166b22b14c9e361884742967c062331ab5c36bf173230376e2e35e39dea54931","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":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"043c3e68b3012fdd258b76934c6833062972664cad7f7d266e07b03f8eaa062d","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"6a3a395b4e54fe26836a6ae8e10af5d8d840e14eb3765d73aea9590a6401412c","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"91P0P4sXLQrbHdYnvL9xC7otOsmGYwoglKa3Fh8m98RlxY4ezhmJnpInARXBsC9WVSqHwccee8pyaewMUGV8Bg"},"schema":"pubphys.envelope/1"},"record_hash":"043c3e68b3012fdd258b76934c6833062972664cad7f7d266e07b03f8eaa062d","leaf_index":2760}