Bistable All-Josephson Junction SQUID with Dual Φ-Junctions for State-Controlled Superconducting Circuits

A bistable superconducting quantum interference device (SQUID) exclusively comprising Josephson junctions (JJs) is proposed. The design integrates two $2 \Phi$-JJs within the loop structure, while the state of the SQUID is monitored through a conventional $2 \pi$-periodic $\mathbf{J J}$ ($\mathbf{0}$-JJ). This configuration eliminates the need for geometric inductors, leveraging the nonlinear phase dynamics for bistability. Extensive simulations confirm robust bistable operation under controlled external flux bias, positioning the proposed SQUID as an area-efficient building block for superconducting memory cells, sensors for various applications, and SFQ-compatible logic elements.