Using a high-value resistor in triangle comparisons of electrical standards

We propose an experiment with some advantages over other direct quantum metrology triangle comparisons. First, by using a cryogenic resistor that can be calibrated, the quantized Hall resistance (QHR) standard needs to be used only for short periods. Second, the experiment does not require a voltage detector. This eliminates one external source of noise and allows fast current reversals. Third, feedback that might contribute to excess noise and superconducting quantum interference device flux-jump behavior is also absent in the primary comparison system. This experiment could be run at higher currents and without supervision for extended periods of time, to benefit from statistical reduction of noise. We have developed a cryogenic current comparator for calibrating the cryogenic resistor directly against the QHR.