We have observed a telegraph-like noise in dc superconducting quantum interference devices (SQUID’s) made of low-temperature synthesized superconducting Y-Ba-Cu oxide thin films. The voltage of the SQUID jumps among two to four discrete levels randomly with time, and exhibits a Lorentzian type frequency dependence in the power spectrum. Periodic modulations of the voltage with magnetic flux are observed in a SQUID having narrow bridges of submicrometer width. The flux noise of the SQUID is dominated by the telegraph-like noise at low frequencies.
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Matsuda et al. (1988) studied this question.
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