{"paper":{"title":"Pure dephasing in flux qubits due to flux noise with spectral density scaling as $1/ f^\\alpha$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall","quant-ph"],"primary_cat":"cond-mat.supr-con","authors_text":"A. D. Fefferman, A. Shnirman, C. M\\\"uller, D. S. Golubev, F. C. Wellstood, G. C. Hilton, Gerd Sch\\\"on, H.-M. Cho, John Clarke, J. S. Birenbaum, K. D. Irwin, S. M. Anton, S. R. O'Kelley","submitted_at":"2011-11-30T19:02:51Z","abstract_excerpt":"For many types of superconducting qubits, magnetic flux noise is a source of pure dephasing. Measurements on a representative dc superconducting quantum interference device (SQUID) over a range of temperatures show that $S_\\Phi(f) = A^2/(f/1 \\hbox{Hz})^\\alpha$, where $S_\\Phi$ is the flux noise spectral density, $A$ is of the order of 1 $\\mu\\Phi_0 \\, \\hbox{Hz}^{-1/2}$ and $0.61 \\leq \\alpha \\leq 0.95$; $\\Phi_{0}$ is the flux quantum. For a qubit with an energy level splitting linearly coupled to the applied flux, calculations of the dependence of the pure dephasing time $\\tau_\\phi$ of Ramsey and"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1111.7272","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}