Kavli Affiliate: Tim H. Taminiau
| First 5 Authors: S. Alex Breitweiser, Mathieu Ouellet, Tzu-Yung Huang, Tim H. Taminiau, Lee C. Bassett
| Summary:
Nuclear quadrupolar resonance (NQR) spectroscopy reveals chemical bonding
patterns in materials and molecules through the unique coupling between nuclear
spins and local fields. However, traditional NQR techniques require macroscopic
ensembles of nuclei to yield a detectable signal, which precludes the study of
individual molecules and obscures molecule-to-molecule variations due to local
perturbations or deformations. Optically active electronic spin qubits, such as
the nitrogen-vacancy (NV) center in diamond, facilitate the detection and
control of individual nuclei through their local magnetic couplings. Here, we
use NV centers to perform NQR spectroscopy on their associated nitrogen-14
($^{14}$N) nuclei at room temperature. In mapping the nuclear quadrupolar
Hamiltonian, we resolve minute variations between individual nuclei. The
measurements further reveal correlations between the parameters in the NV
center’s electronic spin Hamiltonian and the $^{14}$N quadropolar Hamiltonian,
as well as a previously unreported Hamiltonian term that results from symmetry
breaking. We further design pulse sequences to initialize, readout, and control
the quantum evolution of the $^{14}$N nuclear state using the nuclear
quadrupolar Hamiltonian.
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