{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"3055ac6414d3770f1c9bffdc8542eefcd07a12200867afe66a2e5fe1f40f5bf5","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"01784e8ebfe3f360fab8de0cac9ae06f86055ac36dd78d079f497b9725e3c460","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.qubit-decoherence-defects.tls-fluctuations","kind":"phenomenon","literature_status":"open","n":"1","parents":[],"plain":"The energy-loss time of a given qubit can change several-fold from hour to hour, because defect frequencies wander in and out of resonance with it. Whether interactions between defects fully explain this wandering is not established.","posed_since":"","precise":"Qubit $T_1$ varies by factors 2-10 over minutes to days, attributed to spectral diffusion of near-resonant two-level defects driven by thermally activated fluctuators with energies $E < T$ (interacting tunneling model; Faoro and Ioffe; Burnett et al. 2014). Test whether the interacting standard tunneling model predicts the spectral-diffusion kernel, the $1/f$ spectrum of defect-frequency noise and its temperature dependence quantitatively, or whether additional mechanisms (quasiparticles, charge traps) are needed.","problem_ref":null,"references":"","settled_by":"Long-time defect spectroscopy versus temperature and strain on one device, compared with interacting tunneling-model predictions using independently fixed parameters.","status_note":"","title":"Why do qubit energy-relaxation times fluctuate over hours?","topic_ref":"228b58abc42aea116ba49a5712e2571d336009d0276f52a950ef3939fbb3059f"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"91ebdf39ccb3f9623325b6cc27fda66ea4d6e280a9433e1028cfeb5235fc38f1","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"591ed478fc940c82b9938b0e5460cc96ca2e1f48c6db7158777bc5381679014b","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"QZEX23NufL4ha1W407expfymCQBQxuAHcJPQqBUUdyHhjtXA02C3l97d_xaYc6Auup6Kqk3HVhN7Bvxhov6JBw"},"schema":"pubphys.envelope/1"},"record_hash":"91ebdf39ccb3f9623325b6cc27fda66ea4d6e280a9433e1028cfeb5235fc38f1","leaf_index":1141}