论文标题
通过纳米磁体的动态模式操纵量子杂质旋转
Manipulating quantum impurity spins via dynamical modes of nanomagnets
论文作者
论文摘要
量子杂质（QI）旋转通过利用室温量子相干性来提供有希望的信息处理和传感应用。在设计当地连贯的驱动器并提高对此类应用的各种信号的敏感性的要求中，搜索混合系统将Qi旋转与物质激发耦合有关，这引起了人们的重大兴趣。我们提出和理论上研究了一个混合系统，该系统将Spin-1 Qi与纳米磁体的动态激发融合在一起，该激发由经典的Spintronics中发现的机制控制。我们表明，在这样的系统中，可以通过利用对纳米磁体模式椭圆率的控制和Qi Spin和Nanomagnet之间的耦合的控制性来设计Qi-Spin的去碳，这是由于与纳米磁体的热激发模式的耦合而设计的。另一方面，当通过电压诱导的扭矩进行电气激活时，我们证明了Qi旋转可以通过利用纳米磁体的固有非线性预训练模式在室温下与较大质量因子相干驱动。我们的结果为实现独特的量子旋转功能提供了理论指导，例如局部连贯的Qi旋转到环境条件，以及基于纳米磁增强QI基于QI的混合动力传感器的设计。
Quantum impurity (QI) spins offer promising information processing and sensing applications by harnessing up to room-temperature quantum coherence. Challenged by the requirement of designing local coherent drives and improving sensitivity to various signals for such applications, the search of hybrid systems coupling QI spins with matter excitations have garnered significant recent interest. We propose and theoretically study a hybrid system that couples spin-1 QI with the dynamical excitations of nanomagnets, which are controlled by mechanisms uncovered in classical spintronics. We show that in such systems the QI-spin decoherence, due to coupling to thermally excited modes of the nanomagnet, can be designed across a wide range by exploiting the control over nanomagnet's mode ellipticity and the chiral nature of the coupling between the QI spin and nanomagnet. On the other hand, when activated electrically via voltage-induced torques, we demonstrate that QI spins can be driven coherently with large quality factors at room temperature by leveraging inherent non-linear precessional modes of the nanomagnet. Our results provide theoretical guidance for enabling unique quantum spintronic functionalities, such as local coherent driving of QI spins up to ambient conditions, and the design of nanomagnet-enhanced QI-based hybrid sensors.
