  Sensitive magnetometers that can operate in high magnetic fields are
essential for detecting magnetic resonance signals originating from small
ensembles of quantum spins. Such devices have potential applications in quantum
technologies, in particular quantum computing. We present a novel experimental
setup implementing a differential flux measurement using two DC-SQUID
magnetometers. The differential measurement allows for cancellation of
background flux signals while enhancing sample signal. The developed protocol
uses pulsed readout which minimizes on-chip heating since sub-Kelvin
temperatures are needed to preserve quantum spin coherence. Results of a proof
of concept experiment are shown as well.
