Journal
PHYSICAL REVIEW B
Volume 82, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.201201
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Funding
- NIST
- NSF
- DARPA
- Direct For Mathematical & Physical Scien
- Division Of Physics [855599] Funding Source: National Science Foundation
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We present an experimental and theoretical study of electronic spin decoherence in ensembles of nitrogen-vacancy (NV) color centers in bulk high-purity diamond at room temperature. Under appropriate conditions, we find ensemble NV spin coherence times (T(2)) comparable to that of single NV with T(2) > 600 mu s for a sample with natural abundance of (13)C and paramagnetic impurity density similar to 10(15) cm(-3). We also observe a sharp decrease in the coherence time with misalignment of the static magnetic field relative to the NV electronic spin axis, consistent with theoretical modeling of NV coupling to a (13)C nuclear-spin bath. The long coherence times and increased signal-to-noise provided by room-temperature NV ensembles will aid many applications of NV centers in precision magnetometry and quantum information.
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