  Many of the challenges of scaling quantum computer hardware lie at the
interface between the qubits and the classical control signals used to
manipulate them. Modular ion trap quantum computer architectures address
scalability by constructing individual quantum processors interconnected via a
network of quantum communication channels. Successful operation of such quantum
hardware requires a fully programmable classical control system capable of
frequency stabilizing the continuous wave lasers necessary for trapping and
cooling the ion qubits, stabilizing the optical frequency combs used to drive
logic gate operations on the ion qubits, providing a large number of analog
voltage sources to drive the trap electrodes, and a scheme for maintaining
phase coherence among all the controllers that manipulate the qubits. In this
work, we describe scalable solutions to these hardware development challenges.
