One or more real time engines of a quantum computer provide quantum measurement information to a classical computing engine via a classical function call. The quantum computer includes a controller comprising the one or more real time engines in communication with the classical computing engine, and a quantum processor. The controller is configured to control operation of one or more components of the quantum processor. The real time engines receive a classical call response comprising an indication of a result determined via execution of a classical function by the classical computing engine based at least in part on the classical function call; and control operation of the one or more components of the quantum processor based at least in part on the result.