This repository contians the C implementation of Quantum Analyitic Descent which is a technique for the optimisation of variational quantum circuits. Our code implements the classical algorithm for computing the gradient vector as described in the preprint:

[1] Quantum Analytic Descent, Bálint Koczor, Simon C Benjamin (2020) ArXiv preprint, arXiv:2008.13774

The C code contains a binding to Mathematica and a demonstration notebook has been included that shows how this code can be used in tandem with QuESTlink.