RF, mm-wave and THz circuits 
Quantum and cryogenic circuits Quantum computers have received a lot of attention in recent years. A major research objective is to scale up the number of qubits in the quantum computers.
In order to facilitate this scaling, it is useful to locate the control electronics as close to the qubits as possible. Having an amount of external wiring that scales with the number of qubits is currently a major limiting factor due to space constraints and cooling capacity.
Having electronics close to the qubits also allows for a short feedback loop between classical and quantum systems. This is of great importance to many types of quantum error correction and variational quantum algorithms.
In a configuration that is currently being studied, the electronics are kept at 4K, while the qubits operated in the mK range. In this case the qubits are driven by 8-12 GHz pulses.
The aim of this research is to increase the oscillator frequency to mm-wave frequencies, which could allow the qubits to operate at 4K. Eliminating the need for the lower temperatures could save a lot of power.
