1/f frequency noise of superconducting resonators in large magnetic fields

摘要

Recent experiments have indicated surface spins in superconducting devices to be associated with both flux- and charge noise. In particular, for superconducting resonators, where the frequency noise is dominated by the electric field from the resonator coupling to spurious two-level material defects, information on noise in applied magnetic fields is lacking. Here, we present measurements of frequency noise in a superconducting resonator with a centre frequency f(0) = 6.1 GHz in fields exceeding the Zeeman splitting of surface spins (up to 310 mT), showing that the charge-induced noise is unaffected by the applied magnetic field. Published by AIP Publishing.