The development of power system has put forward higher requirements for electrical metrology. However, the traditional measurement based on artefact has encountered a bottleneck due to its instability. In order to reduce the uncertainty of measurement, metrology based on quantum technology has been wildly studied. This paper introduces the principle of quantum voltage and two types of Josephson voltage standards, programmable Josephson voltage standards and AC Josephson voltage standards. The development and current progress of quantum voltage is introduced.
 

quantum voltage;Josephson effect;application