Demonstration of a Josephson vortex-based memory cell with microwave energy-efficient readout

Abstract

The ongoing progress of superconducting logic systems with Josephson junctions as base elements requires the development of compatible cryogenic memory. Long enough junctions subject to magnetic field host quantum phase 2π-singularities—Josephson vortices. Here, we report the realization of the superconducting memory cell whose state is encoded by the number of present Josephson vortices. By integrating the junction into a coplanar resonator and by applying a microwave excitation well below the critical current, we are able to control the state of the system in an energy-efficient and non-destructive manner. The memory effect arises due to the presence of the natural edge barrier for Josephson vortices. The performance of the device is evaluated, and the routes for creating scalable cryogenic memories directly compatible with superconducting microwave technologies are discussed.

Pair Correlation Influence on Superconductors Josephson Penetration Depth

“…The developed equation in methodology section EQUATION ( 14) and EQUATION ( 9) and to study the nature of developed equation was computed using MATLAB and for this data form [26][27][28] and study the nature of JPD with temperature and with fermi velocity as shown in FIGURE 1 and 2 respectively. The nature of Josephson penetration Depth (JPD) to electronphonon and transition temperature in FIGURE 1 shoes that JPD decrease with increasing temperature.…”

“…Integration into coplanar resonators enables scalability and compatibility with superconducting microwave technologies. Additionally, NbN/Au nanogaps bridged with Al superconductor exhibit high critical current density and Josephson coupling, highlighting the importance of superconducting barriers for achieving high Josephson current in nanodevices, crucial for superconducting circuits with high integration density [27][28].…”