Applications of the josephson–technology

J. Ottes

Uttam Ghoshal, T. Van Duzer, Harry Kroger

The authors describe the development of circuit models, applications of superconducting field effect transistors (SFETs), and higher-voltage Josephson junction (HVJJ) circuits which are important for the feasibility of several novel hybrid superconducting-semiconducting circuits. They also discuss the delay optimization involved in designing and embedding interface circuits in a hybrid superconductor-semiconductor technology. It is noted that, with the advances made in semiconductor technologies, interfaces between the two technologies are practical now and the advantages of hybrid circuits in various applications should be realizable in practice. In the case of interfacing typical Nb-based Josephson junction circuits to 0.5 mu m CMOS technologies, it was estimated that the minimum delay through the interface is approximately 110 ps and the optimum number of junctions in each branch of the HVJJ circuits is 10.>

Stefan Benacka, L. Ondris

David Schuster, Andrew Oriani, Larry Chen

Technologies for tuning a resistance of tunnel junctions such as Josephson junctions are disclosed. In the illustrative embodiment, a Josephson junction is heated to 85 Celsius, and an electric field is applied to the Josephson junction. The heat and the electric field cause the resistance of the Josephson junction to increase. Monitoring the Josephson junction during the application of the electric field allows for the resistance of the Josephson junction to be adjusted to a particular value.

Antonio Alci Barone, S. Pagano

Shuichi Nagasawa, Hideaki Numata, Shuichi Tahara