{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"764a38ffb80bc3831ff211c08d579f0b8f9524c00c4516549a285042fdc25945","created":"2026-10-03T07:18:10Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"6d99d5ac03f6994dd685cfb7deb17570668ef076b825e91a0a52cfb6723b085d","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":[],"external_id":"qi.quantum-thermo.coherent-work-statistics","kind":"phenomenon","literature_status":"contested","n":"1","parents":[],"plain":"The usual way to measure work, measuring energy before and after, destroys superpositions between energy levels. A 2017 theorem showed no measurement scheme both keeps the standard results and gives the right average work for every state.","posed_since":"2017","precise":"Perarnau-Llobet et al. (PRL 2017) proved that no POVM-based work distribution $P(W)$ both reproduces two-point-measurement statistics for states diagonal in energy and gives $\\langle W\\rangle = \\operatorname{Tr}[\\rho (U^{\\mathrm{dag}} H_1 U - H_0)]$ for all states. Determine which relaxed object (a quasiprobability such as Kirkwood-Dirac or Margenau-Hill, or a disturbing measurement scheme) is the operationally correct description of work for coherent states, judged by fluctuation theorems and experimental accessibility.","problem_ref":null,"references":"","settled_by":"Operational criteria with a proof that one definition uniquely meets them, plus an experiment measuring it.","status_note":"","title":"Work fluctuations for quantum states with energy coherence","topic_ref":"742b38754a9f76dd32b7efe7d343f52ad880f5cd0826c1581b9a9198dd522611"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"3e97571c8939d9eb6e428d275b7cd0dd6e0b63f371341d5dfec46766432a6597","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"c6ceefc8152273cffdf45df7a7c81916de261df02415700d05c513c258f7382a","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"K-UXNIzLH3rNkLHNPw-h1QbpVmtZCTwtrwS9kiQKLSqUN5Ma75sIenWgH-ZmmKOSCx4ygTRYAZLhnQLKM8fmAA"},"schema":"pubphys.envelope/1"},"record_hash":"3e97571c8939d9eb6e428d275b7cd0dd6e0b63f371341d5dfec46766432a6597","leaf_index":2040}