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首页> 外文期刊>Physical Review X >Ultralong Dephasing Times in Solid-State Spin Ensembles via Quantum Control
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Ultralong Dephasing Times in Solid-State Spin Ensembles via Quantum Control

机译：通过量子控制在固态旋转集合中的超龙相超时

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Quantum spin dephasing is caused by inhomogeneous coupling to the environment, with resulting limits to the measurement time and precision of spin-based sensors. The effects of spin dephasing can be especially pernicious for dense ensembles of electronic spins in the solid state, such as nitrogen-vacancy (NV) color centers in diamond. We report the use of two complementary techniques, spin-bath driving, and double quantum coherence magnetometry, to enhance the inhomogeneous spin dephasing time ( T 2 * ) for NV ensembles by more than an order of magnitude. In combination, these quantum control techniques (i)?eliminate the effects of the dominant NV spin ensemble dephasing mechanisms, including crystal strain gradients and dipolar interactions with paramagnetic bath spins, and (ii)?increase the effective NV gyromagnetic ratio by a factor of two. Applied independently, spin-bath driving and double quantum coherence magnetometry elucidate the sources of spin ensemble dephasing over a wide range of NV and bath spin concentrations. These results demonstrate the longest reported T 2 * in a solid-state electronic spin ensemble at room temperature and outline a path towards NV-diamond dc magnetometers with broadband femtotesla sensitivity.
机译：量子旋转去除由与环境不均匀耦合引起的，导致基于旋转传感器的测量时间和精度的产生限制。旋转去除的效果可以特别是在固态中的电子旋转的致密合并，例如金刚石中的氮空位（NV）颜色中心。我们报告使用两个互补技术，旋转浴缸驱动和双量子相干磁力，以增强NV旋转时间（T 2 *）的不均匀旋转时间超过一个多个数量级。组合，这些量子控制技术（i）？消除显性NV旋转集合去除机制的效果，包括晶体应变梯度和与顺磁浴旋转的偶极相互作用，（II）α增加有效的NV旋转磁性比例二。独立地施加，旋转浴驾驶和双量子相干磁度测量磁体阐明旋转整体源于宽范围的NV和浴旋转浓度。这些结果证明了在室温下固态电子旋转集合中的最长报告的T 2 *，并概述了具有宽带Femtotesla敏感性的NV-金刚石直流磁力计的路径。

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