Theoretical Background ======================= The following sections contain exerts from: * Matwiejew, E. & Wang, J. B. QuOp_MPI: A framework for parallel simulation of quantum variational algorithms. Journal of Computational Science 62, 101711 (2022). * Matwiejew, E., Pye J. & Wang J. B. Quantum Optimisation for Continuous Multivariable Functions by a Structured Search. arXiv:2210.06227, (2022). Which are availble as preprints on arXiv. .. include:: ../background/combinatorial.rst .. include:: ../background/multivariable.rst