Mutual inductance measurement with programmable Josephson system

We developed a magnetic flux measurement system which is based on the binary Josephson system two years ago. After that, we continue researching on the improvement of magnetic flux measurement and start to focus on the precision measurement of the mutual inductance with the flux measurement system we built before. This paper introduces the mutual inductance measurement method which is based on the programmable Josephson system at NIM. Experimental results show that the type A uncertainty of the measurement of mutual inductances of 341 mH and 577 mH is less than 2 ppm, which demonstrates the feasibility and reliability of the flux and mutual inductance measurement method we proposed.