A direct comparison of two voltages at 0.6 V reproduced by programmable arrays with Nb/Al/AlOx/Al/AlOx/Al/Nb Josephson junctions was carried out using a SQUID as a null detector. The voltage difference was measured and found to be smaller than 1.2 × 10−17 V. Jumps of the current in the flux transformer loop can be attributed to phase-slipping events when the phase lock in the arrays is broken.
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Krasnopolin et al. (2002) studied this question.
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