# Programmable soliton dynamics in all-Josephson-junction logic cells and networks

## TL;DR

The paper introduces a new design for Josephson junction networks that allows for programmable control of soliton dynamics, enabling robust and flexible logic and computing systems.

## Contribution

The novel contribution is a tunable Josephson junction cell design that enables programmable soliton control and unidirectional propagation.

## Key findings

- A structural asymmetry in transmission lines creates a Josephson diode for unidirectional soliton propagation.
- Programmable kinetic inductance allows selective activation or deactivation of diode functionality.
- Artificial inhomogeneity improves robustness in all-Josephson-junction logic and neuromorphic systems.

## Abstract

We demonstrate the programmable control of kinetic soliton dynamics in all-Josephson-junction (all-JJ) networks through a novel tunable cell design. This cell enables on-demand switching of transmission lines and operates across defined parameter regimes supporting diverse dynamical modes. By introducing a structural asymmetry into a transmission line, we implement a Josephson diode that enforces unidirectional soliton propagation. The programmability of the kinetic inductance then provides a crucial mechanism to selectively enable or disable this diode functionality. By engineering artificial inhomogeneity into the circuit architecture, we enhance robustness in all-JJ logic circuits, 2D transmission line all-JJ lattices, and neuromorphic computing systems.