Microwave Multiplexing for Quantum Sensing Experiments

Understanding fundamental particle physics is crucial to unraveling the behavior of the universe at its smallest scales. Exotic and elusive particles like neutrinos require ultraprecise experimental study to reveal how they interact with matter and energy.

We developed a measurement apparatus capable of digitizing multiple channels of microwave signals. These signals are modified by resonators whose frequencies shift based on SQUID inductances operating in a Maybell dilution refrigerator. To generate and readout these signals, we used an AMD RFSoC board with firmware that enables continuous signal generation and tone-tracking. We generated a base-GHz signal for the resonators and applied a magnetic flux ramp for flux-ramp modulation techniques, which creates specific ultra-low noise measurements of each resonator.

This approach prepares high-fidelity RF data for analysis and lays the groundwork for precise measurements of exotic particle properties.