Evolution of Hyperfine Couplings to NV Centers under Hydrostatic Pressure

Nuclear spins coupled to color centers exhibit long coherence times and may serve as qubits for solid state quantum technologies. For the NV center in diamond, multiple C-13 nuclei couple to the NV electronic spin, even for natural abundance carbon. These couplings are expected to change under pressure, reflecting changes to the NV wavefunction as the lattice contracts. We have performed optically detected magnetic resonance in a diamond anvil cell and observed how the spectrum evolves. We will discuss the challenges of performing ODMR under pressure, including delivering microwaves inside of the cell.