Abstract: This paper introduces the quantum DC nanovoltage standard.It includes basic principle,composition of the standard,implementation plan,and measurement dada.the quantum DC nanovoltage standard is based on AC Josephson effect.It utilizes differential principle which is based on programmable Josephson DC voltage standard to generate nanovoltage.The paper proposed a basic plan and an improved design plan,further enhancing the performance of the standard.The quantum DC nanovoltage standard is able to provide high precision quantum DC nanovoltage signals,which not only provides a new means for precise measurement of DC voltage,but also solves the problem of nanovoltage traceability.

Key words: Programmable, Quantum, Voltage standard, Nanovoltage, Precise measurement, Traceability