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In the development of new theory, computational cost is also an important factor.  In many cases, a code can provide optimized and parallelized building blocks that developers can use to produce highly efficient code without  In this sense, we have found that the traditional picture of an state as the basic object is not adequate for optimal performance, as it does not expose enough data parallelism~\cite{Andrade_2012_gpus}.  In order to numerically calculate physical observables we need to discretise  the problem. To this end, we use a mesh representation (e.g. which changes the charge