https://www.nist.gov/publications/10-v-programmable-josephson-voltage-standard-circuits-using-nbntinxnbntinxnbn-double
Using NbN/TiNx/NbN/TiNx/NbN double-junction stack technology we have demonstrated programmable Josephson voltage standard chips that operate up to 10.16 V outpu
josephson voltage standardprogrammablecircuitsusingnbn