We describe the construction of a fast field cycling device capable ofsweeping a 4-order-of-magnitude range of magnetic fields, from ~1mT to 7T, inunder 700ms. Central to this system is a high-speed sample shuttling mechanismbetween a superconducting magnet and a magnetic shield, with the capability toaccess arbitrary fields in between with high resolution. Our instrument servesas a versatile platform to harness the inherent dichotomy of spin dynamics onoffer at low and high fields - in particular, the low anisotropy, fast spinmanipulation, and rapid entanglement growth at low field as well as the longspin lifetimes, spin specific control, and efficient inductive measurementpossible at high fields. Exploiting these complementary capabilities in asingle device open up applications in a host of problems in quantum control,sensing, and information storage, besides in nuclear hypepolarization,relaxometry and imaging. In particular, in this paper, we focus on the abilityof the device to enable low-field hyperpolarization of 13C nuclei in diamondvia optically pumped electronic spins associated with Nitrogen Vacancy (NV)defect centers.

Wide dynamic range magnetic field cycler: Harnessing quantum control at low and high fields