High fidelity bi-directional nuclear qubit initialization in SiC

TL;DR

This paper demonstrates high-fidelity, reversible nuclear spin initialization in silicon carbide using dynamic nuclear polarization, enabling room-temperature quantum control with minimal magnetic fields for advanced sensing and quantum information applications.

Contribution

It introduces a method for near-unity polarization and reversible control of nuclear spins in SiC using DNP at low magnetic fields, expanding quantum control capabilities.

Findings

Achieved near-unity nuclear spin polarization in SiC.

Reversed nuclear polarization with sub-Gauss magnetic field changes.

Enabled room-temperature, RF-free nuclear spin control.

Abstract

Dynamic nuclear polarization (DNP) is an attractive method for initializing nuclear spins that are strongly coupled to optically active electron spins because it functions at room temperature and does not require strong magnetic fields. In this Letter, we demonstrate that DNP, with near-unity polarization efficiency, can be generally realized in weakly coupled hybrid registers, and furthermore that the nuclear spin polarization can be completely reversed with only sub-Gauss magnetic field variations. This mechanism offers new avenues for DNP-based sensors and radio-frequency free control of nuclear qubits.