{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"06bc194bff90efb993f0b980392029f0daecd9c1f917e909753183ed21f5c54c","created":"2026-10-03T07:18:10Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"cf8855fce02b71517c8a57ce0233ad9e560fbc40613ea7304f9ebad8795c3352","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"qi.qubit-platform-limits.ion-trap-anomalous-heating","kind":"phenomenon","literature_status":"open","n":"1","parents":[],"plain":"Ions held above metal electrodes heat up far faster than the electrical noise of the metal predicts, which spoils the shared motion that ion-qubit gates use. Which surface process produces this excess electric-field noise is not established.","posed_since":"","precise":"Trapped ions at ion-electrode distance $d$ and secular frequency $\\omega$ show electric-field noise spectral density $S_E(\\omega)$ orders of magnitude above the Johnson-noise value, with approximate power laws $S_E \\sim \\omega^{-a} d^{-b}$ ($b$ reported roughly between 2 and 4), strong dependence on electrode temperature and large reductions after surface cleaning (exponents approximate). Identify the dominant microscopic mechanism (fluctuating adsorbate dipoles, two-level fluctuators in surface layers, patch-potential diffusion or other) and give a model that predicts $S_E$ as a function of $d$, $\\omega$, $T$ and surface preparation.","problem_ref":null,"references":"","settled_by":"A model that predicts measured $S_{E}(\\omega, d, T)$ across traps of different materials and surface treatments, confirmed by surface-science characterization of the same electrodes.","status_note":"Surface cleaning and cryogenic operation lower the noise by orders of magnitude, but no single mechanism accounts for all data (review: Brownnutt, Kumph, Rabl and Blatt, Rev. Mod. Phys. 87, 1419, 2015, arXiv:1409.6572).","title":"Microscopic origin of anomalous motional heating in ion 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