Fast and modular measurement platform for quantum dots tuning into the spin qubit regime*

Spin qubits are a promising architecture for quantum computers thanks to their long coherence time and compatibility with industrial fabrication techniques. However, qubits characterization and initialization in a desired configuration is a time-consuming process. Such challenges are slowing down progress in this field of research, especially when studying multi-qubit systems. To address those problems, a fast and modular measurement platform for spin qubits, using Field Programmable Gate Arrays (FPGAs), is presented. We also introduce a “Park and Fly” technique, implemented on this platform, to measure the stability diagram of quantum dots. By doing so, it is possible to achieve high voltage amplitudes with high resolution by combining DC and AC signals. A “Park” DC signal is set to measure a specific part of a stability diagram while a “Fly” AC signal is allowing high resolution sweeping in the region around the “Park” signal. As a proof of concept, this technique is tested on a quantum dot simulator implemented directly inside an FPGA. By combining this approach with the modularity of the platform, efficient and simultaneous characterization of multiple qubit devices is feasible.