pyjjasim 2.2.4

Circuit simulator for josephson junctions and passive components

PyJJASim

Circuit Simulator including Josephson Junctions in Python

Installation

PyJJASim requires numpy, scipy and matplotlib

pip install pyjjasim

Introduction

PyJJASim is a circuit simulator including Josephson Junctions as components,

intended to be used on large Josephson Junction Arrays (JJAs).

PyJJASim is specialized in keeping track of Josephson vortices in the circuit.

It can also compute static configurations that have vortices at desired

locations in the circuit.

This requires that the circuit is a planar embedding (in 2D), such that

one can unambiguously refer to faces of the circuit, and vortices reside

at faces. This imposes that nodes in the circuit must be placed

at 2D coordinates, and that no junctions can cross. This also means no

hierarchical structure is supported.

Features

• supports basic components (inductors, resistors, capacitors and current- and voltage sources)

• keep track of (and place) Josephson vortices in the circuit

• compute static configurations

• determine dynamic stability of static configurations

• maximize parameters that have stable static configurations

• compute time evolutions

• define external magnetic flux through each face

• thermal fluctuations modeling nonzero temperature

• visualization and animation of simulation results

Documentation

api documentation\

whitepaper\

user manual

Example Usage

from pyjjasim import *



array = SquareArray(3, 3)

problem = StaticProblem(array, frustration=0.1)

config, status, info = problem.compute()

print(config.get_I())

Program output:

[-0.30917 -0.30917 0 0 0.30917 0.30917 0.30917 0 -0.30917 0.30917 0 -0.30917]

If you have any questions, comments, complaints,

bug reports, feature requests, etc.

please contact me at [e-mail]!