{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"ee41d1c53e5e57c928e99ccd5a81e0f3197f4fb307b51f5433679ff410668b5a","created":"2026-10-03T07:17:49Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"e9b948a7e5c562206af1319837bf987cb9b3e03e8c912aece142beb3f68eb2f9","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"amo.noisy-quantum-metrology","field":"amo","n":"1","review_cite":"R. Demkowicz-Dobrzanski, J. Kolodynski, M. Guta, The elusive Heisenberg limit in quantum-enhanced metrology, Nature Communications, 2012","review_link":"https://doi.org/10.1038/ncomms2067","review_verified":"true","summary":"Entangled atoms or photons can in principle measure a quantity with error falling as $1/N$ instead of $1/\\sqrt{N}$ for $N$ particles. Noise usually destroys this gain, and it is not fully known when and how it can be kept.","title":"Limits of quantum-enhanced metrology under noise","topic_ref":null,"why":"These limits decide whether entanglement can improve real clocks, interferometers and field sensors."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"b95a8ff18c070433c3fe82a6890e1ebb1ad0aa64cad14ab4a8806dfeb3a86077","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"c12773ae6c1d071a06e17f53419a95ffb5090c686267c6959be8a733462fe86f","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"XILDig_LF1F538y4BRiFQfhnT4hL3K-Rqcvb6cCJZcJWOjMe0dgSZh7QNyKsBfA4ZrhEQIsbOzdPI73u4hqbAg"},"schema":"pubphys.envelope/1"},"record_hash":"b95a8ff18c070433c3fe82a6890e1ebb1ad0aa64cad14ab4a8806dfeb3a86077","leaf_index":19}