论文标题
超越点偶极子近似的旋转发射器
Spin emitters beyond the point dipole approximation in nanomagnonic cavities
论文作者
论文摘要
在量子信息科学到自由基的纳米化学等各种领域，对发射器的自旋状态之间的过渡速率的控制至关重要。我们提出了一种方法，可以通过将其放置在纳米磁性腔中，以驱动自旋发射极的电动和磁极孔孔的过渡，这需要描述超出点偶极子近似值的旋转发射极和纳米磁性腔的真空磁场，并具有大量的空间梯度，均超过了旋转液体的大量空间梯度。我们特别研究了钻石中的SIV $^ - $缺陷，其Zeeman-Split基态构成了用于固态量子信息处理的逻辑量子，并耦合到磁性纳米颗粒，可作为模型的纳米磁性腔，能够将微波磁场浓缩到深度潜在的小波中。通过SIV $^ - $旋转轨道的第一原理建模，我们计算了磁性偶极允许和 - 禁止过渡的旋转过渡密度，并将它们的耦合速率计算为纳米磁性腔的各种多极模式。我们设想使用这样的框架在GHz频率尺度下进行量子状态转导和态制备。
Control over transition rates between spin states of emitters is crucial in a wide variety of fields ranging from quantum information science to the nanochemistry of free radicals. We present an approach to drive a both electric and magnetic dipole-forbidden transition of a spin emitter by placing it in a nanomagnonic cavity, requiring a description of both the spin emitter beyond the point dipole approximation and the vacuum magnetic fields of the nanomagnonic cavity with a large spatial gradient over the volume of the spin emitter. We specifically study the SiV$^-$ defect in diamond, whose Zeeman-split ground states comprise a logical qubit for solid-state quantum information processing, coupled to a magnetic nanoparticle serving as a model nanomagnonic cavity capable of concentrating microwave magnetic fields into deeply subwavelength volumes. Through first principles modeling of the SiV$^-$ spin orbitals, we calculate the spin transition densities of magnetic dipole-allowed and -forbidden transitions and calculate their coupling rates to various multipolar modes of the nanomagnonic cavity. We envision using such a framework for quantum state transduction and state preparation of spin qubits at GHz frequency scales.
