JOINUS: A User-friendly Open-source Software to Simulate Digital Superconductor Circuits

Single flux quantum (SFQ) based circuits are the subject of renewed attention due to their high speed and their very high energy efficiency. However, the need of cryogenic temperature, the complex physics of Josephson junctions and the lack of proper EDA tools causes slow progress in the field of superconducting electronics. In this work we introduce a new open source program named JOsephson INterface Utility Software (JOINUS [1]) that incorporates SPICE-based simulator engines, improved physical models and several powerful built-in routines. JOINUS is based on a user-friendly environment available on Linux, MacOS and Windows platforms to simplify the design and analysis of superconducting digital circuits.