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A compact Programmable Josephson Voltage Standard (PJVS) system based on a cryocooler is under development at the National Institute of Advanced Industrial Science and Technology (AIST). The system uses a 2 V NbN/TiN/NbN PJVS chip operating at 12 K. Since the PJVS chip requires cooling power of less than 100 mW, it is possible to use a compact-size cryocooler, which may be mounted inside a standard...
A programmable Josephson voltage standard (PJVS) circuit including 65,536 NbN/TiN/NbN Josephson junctions has been demonstrated at temperature of 12 K cooled with a cryocooler. The upper limit of the operating temperature has found to be about 13 K, while the operating margin significantly degraded.
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