论文标题
钻石中的动态量子相变：量子计量学中的应用
Dynamical quantum phase transition in diamond: applications in quantum metrology
论文作者
论文摘要
非平衡动力学是研究量子系统的最重要方案。没有平衡对应物的新特征的出现，例如动态量子相变（DQPT），引起了广泛的关注。在这项工作中，我们偏离了众所周知的Ising模型，并展示了与附近的碳13核自旋相互作用的负电荷氮胶合中心的实验可访问的配置。我们在DQPT的背景下为该系统提供了新的见解。我们表明，通过适当选择外部磁场的横向和纵向成分之间的关系，核自旋会经历DQPT。此外，我们可以通过时间依赖性的纵向磁场引导DQPT，并应用此控制以增强核自旋之间耦合强度的估计。此外，我们提出了一种源自中央电子自旋旋转的新型淬火动力学，该动力学源于中央电子自旋的旋转，该动力学依赖于超精细耦合的各向异性控制DQPT。
Nonequilibrium dynamics is a paramount scenario for studying quantum systems. The emergence of new features with no equilibrium counterpart, such as dynamical quantum phase transition (DQPT), has attracted wide attention. In this work, we depart from the well known Ising model and showcase an experimentally accessible configuration of a negatively charged Nitrogen-Vacancy center that interacts with nearby Carbon-13 nuclear spins. We provide new insights into this system in the context of DQPT. We show that nuclear spins undergo DQPT by appropriately choosing the relation between the transverse and longitudinal components of an external magnetic field. Furthermore, we can steer the DQPT via a time-dependent longitudinal magnetic field and apply this control to enhance the estimation of the coupling strength between the nuclear spins. Moreover, we propose a novel quenched dynamics that originates from the rotation of the central electron spin, which controls the DQPT relying on the anisotropy of the hyperfine coupling.
