Load compensation bridge for Josephson arbitrary waveform synthesizers

The Josephson arbitrary waveform synthesizer is a quantum based voltage source that can generate arbitrary waveforms with quantum accuracy. However, these state of the art performances are drastically decreased by the wiring connecting the source to the device under test. This wiring introduces deviations from the Josephson voltage which scale quadratically with frequency. This paper describes a load compensation bridge that fully compensates the load of the Josephson arbitrary waveform synthesizer by the input impedance of the device under test and completely suppresses the frequency dependence up to a frequency of 80 kHz with an overall uncertainty of 1.7 ppm.