Development of a Quantum AC Voltage Standard Based on Externally Shunted Josephson Arrays

An AC-voltage standard operating at 1 V level at 1 kHz based on nonhysteretic Josephson junction arrays (JJA) is under development. The electronics connected to the array is now sufficiently fast and noiseless when aiming at a 1-ppm accuracy. Some preliminary results and the current setup and status are reported

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