We study a circuit where a mesoscopic Josephson junction (JJ) is embedded in an environment consisting of a large bias resistor and a normal-insulator-superconductor (NIS) junction. The effective Coulomb blockade of the JJ can be controlled by the tunneling current through the NIS junction leading to transistor-like characteristics. We show using phase correlation theory and numerical simulations that substantial current gain with low current noise (in≲1 fA/√Hz) and noise temperature (≲0.1 K) can be achieved. Good agreement between our numerical simulations and experimental results is obtained.
- Josephson junction
Hassel, J., Seppä, H., Delahaye, J., & Hakonen, P. (2004). Control of Coulomb blockade in a mesoscopic Josephson junction using single electron tunneling. Journal of Applied Physics, 95(12), 8059 - 8062. https://doi.org/10.1063/1.1751231