# PyZX: Large Scale Automated Diagrammatic Reasoning

## TL;DR

PyZX is an open source library that automates reasoning about large ZX-diagrams, aiding quantum circuit optimization, validation, and visualization through the ZX-calculus framework.

## Contribution

Introduction of PyZX, a comprehensive tool for automated diagrammatic reasoning in quantum computing using ZX-calculus, supporting optimization and validation of quantum circuits.

## Key findings

- PyZX enables efficient circuit optimization.
- PyZX validates quantum circuit equivalences.
- PyZX integrates with other quantum software tools.

## Abstract

The ZX-calculus is a graphical language for reasoning about ZX-diagrams, a type of tensor networks that can represent arbitrary linear maps between qubits. Using the ZX-calculus, we can intuitively reason about quantum theory, and optimise and validate quantum circuits. In this paper we introduce PyZX, an open source library for automated reasoning with large ZX-diagrams. We give a brief introduction to the ZX-calculus, then show how PyZX implements methods for circuit optimisation, equality validation, and visualisation and how it can be used in tandem with other software. We end with a set of challenges that when solved would enhance the utility of automated diagrammatic reasoning.