With the increasing activities of designing (cryogenic) circuits for qubits, the necessity for simulation tools for qubit-electronics combinations is rising as well. This is especially true for semiconductor spin qubits where the potential of large-scale 3D integration is counted as a deciding advantage of the technology. To realize 3D integration with dedicated electronics, combined simulations (co-simulations) are essential. Different ideas have been proposed for co-simulation, from integrating qubits into circuit schematic simulators [1-3], to using interfaces between different software tools [1,4]. These ideas differ in their computational complexity, but also in the accuracy and the inclusion of physical properties. We will present a review on the current state of the art and show current results of ongoing co-simulation efforts.
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