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(a) Measurement setup. (b) A simplified circuit layout for a dc-SQUID. (c) Electron micrograph of a dc-SQUID partially fabricated on a membrane. (c) Electron micrograph image of a nanobridge.
Hysteretic current-voltage measurements. Panel (a) shows dc-SQUID voltage traces measured for increasing and decreasing current excitation sweeps. Panels (b) and (c) show measurement and simulation results, respectively, of increasing and decreasing threshold currents as a function of the excitation frequency.
Intermittent behavior. (a) Measured average squared voltage of the dc-SQUID. (b)–(e) Time traces of the dc-SQUID voltage taken at the working points marked by the corresponding letter in panel (a).
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