论文标题
国家依赖性语音量子有限的氮 - 视口中心的自旋松弛
State-dependent phonon-limited spin relaxation of nitrogen-vacancy centers
论文作者
论文摘要
了解钻石中氮 - 胶囊中心（NV）中心的自旋含量的极限对于意识到该量子系统的全部潜力至关重要。我们在$ | m_ {s} = - 1 \ rangle \ leftrightArrow | m_ {s} =+1 \ rangle $过渡的速度大约是$ | | m_ {s} = 0 \ langle \ leftrightArrow | m _ pm pm pm pm pm pm pm pm pm pm pm pm pm pm | m_ m_ {高纯度散装钻石中的NV。我们观察到的速率与四个数量级的NV浓度无关，这表明它们受自旋形成相互作用的限制。我们发现，在295 K时NV的理论上最大可实现的相干时间限制为6.8（2）ms。最后，我们对结果进行了理论分析，该分析表明，由于旋转量的哈密顿量中的高级术语而引起的甲级化声子或贡献的贡献是$ | m_ {s} = -1 \ rangle \ langle \ leftright \ leftrightArrow | m_ {s} =+1 \ 1 \ rangle $ $ $ 1 \ rangle $ $ 1 \ rangle $ $ 1 \ rangle $ $ 1 \ 1 速度。
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.
