Phase Logic Based on π Josephson Junctions

The transition to Josephson digital circuits with the representation of information in the form of phase jumps of the superconducting order parameter on heterostructures promises a radical increase in the degree of integration while maintaining high speed and energy efficiency. However, it is not yet possible to manufacture reproducible bistable Josephson junctions, which are necessary for the functioning of the previously proposed basic units of the phase logic. To solve this problem, the concept of phase logic based on pi junctions is proposed and analyzed within the resistive model of Josephson heterostructures. The potential energy of such junctions has a single minimum, with a difference in the order parameters of the electrodes equal to pi. It is demonstrated that the use of pi junctions allows one to implement the entire set of logic devices necessary for the operation of digital computing devices based on phase logic.

Automated summary

This study proposes the concept of phase logic based on π junctions, which solves the problem of manufacturing reproducible bistable Josephson junctions by realizing reproducible π junctions on Josephson heterostructures. The results demonstrate that using π junctions allows for the implementation of the complete set of logic devices necessary for digital computing devices based on phase logic.