State-dependent phonon-limited spin relaxation of nitrogen-vacancy centers

• URL: http://arxiv.org/abs/2007.11529v1
• Date: Wed, 22 Jul 2020 16:38:51 GMT
• Title: State-dependent phonon-limited spin relaxation of nitrogen-vacancy centers
• Authors: M.C. Cambria, A. Gardill, Y. Li, A. Norambuena, J.R. Maze, and S. Kolkowitz
• Abstract summary: We show that relaxation on the $|m_s=-1rangle leftrightarrow |m_s=+1rangle$ transition occurs approximately twice as fast as relaxation on the $|m_s=0rangle leftrightarrow |m_s=pm. Maximum theoretically achievable coherence time for an NV at 295 K is limited to 6.8(2) ms.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Understanding the limits to the spin-coherence of the nitrogen-vacancy (NV) center in diamond is vital to realizing the full potential of this quantum system. We show that relaxation on the $|m_{s}=-1\rangle \leftrightarrow |m_{s}=+1\rangle$ transition occurs approximately twice as fast as relaxation on the $|m_{s}=0\rangle \leftrightarrow |m_{s}=\pm 1\rangle$ transitions under ambient conditions in native NVs in high-purity bulk diamond. The rates we observe are independent of NV concentration over four orders of magnitude, indicating they are limited by spin-phonon interactions. We find that the maximum theoretically achievable coherence time for an NV at 295 K is limited to 6.8(2) ms. Finally, we present a theoretical analysis of our results that suggests Orbach-like relaxation from quasilocalized phonons or contributions due to higher-order terms in the spin-phonon Hamiltonian are the dominant mechanism behind $|m_{s}=-1\rangle \leftrightarrow |m_{s}=+1\rangle$ relaxation, motivating future measurements of the temperature dependence of this relaxation rate.

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