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Critical current fluctuations with a 1/ f spectral density (f is frequency)are potentially a limiting source of intrinsic decoherence in superconductingquantum bits (qubits) based on Josephson tunnel junctions. Prior measurementsof this noise were made at nonzero voltages whereas qubits are operated in thezero voltage state. We report measurements of 1/ f noise in a dcsuperconducting quantum interference device first, coupled to a resonant tankcircuit and operated in a dispersive mode at zero voltage, and, second,operated conventionally with a current bias in the voltage regime. Bothmeasurements yield essentially the same magnitude of critical current 1/ fnoise.Comment: 3 pages, 2 figure

Measurements of 1∕f noise in Josephson junctions at zero voltage: Implications for decoherence in superconducting quantum bits