https://www.nist.gov/publications/precision-measurements-ac-josephson-voltage-standard-operating-margins
Recent advances in circuit design and fabrication of superconducting integrated circuits have enabled us to demonstrate an ac Josephson voltage standard (ACJVS)
josephson voltage standardprecisionmeasurementsacoperating
https://www.nist.gov/publications/zero-compensation-method-and-reduced-inductive-voltage-error-ac-josephson-voltage
In the pulse-driven ac Josephson voltage standard, the low frequency component of the drive signal increases the system complexity and induces unwanted voltages
zerocompensationmethodreducedinductive
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