Josephson vortex-based memory

TL;DR

This paper demonstrates a superconducting memory device that encodes information in the number of Josephson vortices, controllable via microwave excitation, offering a scalable and energy-efficient solution for cryogenic superconducting memory systems.

Contribution

The paper introduces a novel superconducting memory based on Josephson vortices, controllable with microwave signals, and discusses its potential for scalable cryogenic applications.

Findings

Memory state controlled by Josephson vortices

Energy-efficient, non-destructive control method

Potential for integration with superconducting microwave technologies

Abstract

Josephson junctions are currently used as base elements of superconducting logic systems. Long enough junctions subject to magnetic field host quantum phase 2{\pi}-singularities - Josephson vortices. Here we report the realization of the superconducting memory 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 were able to control the state of the memory in an energy-efficent and non-destructive manner. The performance of the device is evaluated, and the routes for creating scalable cryogenic memories directly compatible with superconducting microwave technologies are discussed.