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arXiv 2007.11529cond-mat.mes-hallquant-ph
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氮空位中心的态依赖声子限制自旋弛豫

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

M. C. Cambria, A. Gardill, Y. Li, A. Norambuena, J. R. Maze, S. Kolkowitz

摘要:

理解金刚石中氮空位(NV)中心的自旋相干性的极限对于实现这个量子系统的全部潜力至关重要。我们发现,在$|m_{s}=-1\rangle \leftrightarrow |m_{s}=+1\rangle$过渡的弛豫发生约两倍的速度为$|m_{s}=0\rangle \leftrightarrow |m_{s}=\pm 1\rangle$过渡的弛豫在环境条件下,在高纯度散装金刚石的原生NV。我们观察到的速率是独立的NV浓度超过四个数量级,表明它们是有限的自旋-声子相互作用。我们发现,在295 K的NV的最大理论上可实现的相干时间被限制为6.8(2)ms。最后,我们提出了我们的结果的理论分析表明,Orbach类弛豫从准定域声子或贡献由于高阶项的自旋-声子哈密顿量是$|m_{s}=-1\rangle \leftrightarrow |m_{s}=+1\rangle$弛豫背后的主导机制,激发了对该弛豫速率的温度依赖性的未来测量。

英文摘要:

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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