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As scientists living through a climate emergency, we have a responsibility tolead by example, or to at least be consistent with our understanding of theproblem, which in the case of theoreticians involves a frugal approach tomodelling. Here we present and critically illustrate this principle. First, wecompare two models of very different level of sophistication which neverthelessyield the same qualitative agreement with an experiment involving electricmanipulation of molecular spin qubits while presenting a difference in cost of$>4$ orders of magnitude. As a second stage, an already minimalistic modelinvolving the use of single-ion magnets to implement a network of probabilisticp-bits, programmed in two different programming languages, is shown to presenta difference in cost of a factor of $\simeq 50$. In both examples, thecomputationally expensive version of the model was the one that was published.As a community, we still have a lot of room for improvement in this direction.

A call for frugal modelling: two case studies involving molecular spin dynamics