A TiO2 coating on diamond reduces dark spin density from 2000 to below 200 per square micrometer, doubling the coherence time of near-surface NV centers.
The output voltage signals from the APD are recorded using a National Instruments (NI) 9223 voltage input module installed in an NI cDAQ-9185 data acquisition chassis
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Engineering diamond interfaces free of dark spins
A TiO2 coating on diamond reduces dark spin density from 2000 to below 200 per square micrometer, doubling the coherence time of near-surface NV centers.