  A scaled-up quantum computer will require a highly efficient control
interface that autonomously manipulates and reads out large numbers of qubits,
which for solid-state implementations are usually held at millikelvin (mK)
temperatures. Advanced CMOS technology, tightly integrated with the quantum
system, would be ideal for implementing such a control interface but is
generally discounted on the basis of its power dissipation that leads to
heating of the fragile qubits. Here, we demonstrate an ultra low power,
CMOS-based quantum control platform that takes digital commands as input and
generates many parallel qubit control signals. Realized using 100,000
transistors operating near 100 mK, our platform alleviates the need for
separate control lines to every qubit by exploiting the low leakage of
transistors at cryogenic temperatures to store charge on floating gate
structures that are used to tune-up quantum devices. This charge can then be
rapidly shuffled between on-chip capacitors to generate the fast voltage pulses
required for dynamic qubit control. We benchmark this architecture on a quantum
dot test device, showing that the control of thousands of gate electrodes is
feasible within the cooling power of commercially available dilution
refrigerators.
