Kavli Affiliate: Gregory D. Fuchs
| First 5 Authors: Johnathan Kuan, Gregory D. Fuchs, , ,
| Summary:
The nitrogen-vacancy (NV) center is an emerging platform for constructing
inertial sensors. Its native nitrogen spin can serve as a gyroscope using
Ramsey interferometry protocols. The sensitivities of these nuclear-spin-based
NV gyroscopes are limited by the phase coherence time of the nuclear spin,
which is in turn limited by the $T_1$ of the NV center’s electron spin. There
is an active research effort to decouple the nuclear spin from the electron
spin and other sources of decoherence to extend the phase coherence time past
the NV center electron $T_1$. However, this presents an associated challenge —
how to readout of the nuclear spin ensemble if the electronic spins have
relaxed into a thermal state. We introduce an optical repump pulse to
repolarize electron spins and investigate its effect on the readout of nuclear
spins in this regime. We find for ensemble-based sensors, our readout protocol
has around a six-fold improvement in sensitivity around the excited state
anti-level crossing at 500 G compared to low fields (200 G), despite the
presence of deleterious spin flip-flop dynamics in the excited state.
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