In some aspects, a quantum computing system includes a control system and a quantum processor cell. The control system generates quantum processor control information for a group of devices housed in the quantum processor cell, and each device in the group has a distinct operating frequency. In some cases, a waveform generator generates a multiplexed control signal based on the quantum processor control information, and the multiplexed control signal is communicated an input signal processing system. In some cases, the input signal processing system includes an input channel configured to receive the multiplexed control signal, a de-multiplexer configured to separate device control signals from the multiplexed control signal, and output channels configured to communicate the respective device control signals into the quantum processor cell.