Addressing the many and the individual The ability to coherently manipulate the quantum state of atomic defects in solid-state systems is a promising route to developing a platform for quantum technologies. A successful platform requires the interaction of many qubits in close proximity, as well as the ability to address each qubit individually, and, to date, such requirements have run counter to each other. Chen et al. devised an optical frequency-domain method with which they were able to simultaneously address many individual rare-earth ion defects (six at this point) with separations all within the diffraction limit of the control light. Because the approach is scalable to tens or hundreds of defects, it provides the prospect of realizing truly large-scale quantum processors. Science, this issue p. 592 An optical frequency-domain method is used to coherently manipulate several rare-earth ion qubits simultaneously. Solid-state spin defects are a promising platform for quantum science and technology. The realization of larger-scale quantum systems with solid-state defects will require high-fidelity control over multiple defects with nanoscale separations, with strong spin-spin interactions for multi-qubit logic operations and the creation of entangled states. We demonstrate an optical frequency-domain multiplexing technique, allowing high-fidelity initialization and single-shot spin measurement of six rare-earth (Er3+) ions, within the subwavelength volume of a single, silicon photonic crystal cavity. We also demonstrate subwavelength control over coherent spin rotations by using an optical AC Stark shift. Our approach may be scaled to large numbers of ions with arbitrarily small separation and is a step toward realizing strongly interacting atomic defect ensembles with applications to quantum information processing and fundamental studies of many-body dynamics.

中文翻译：

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衍射极限以下固态自旋的并行单次测量和相干控制

解决多人和个人在固态系统中连贯地操纵原子缺陷量子态的能力是开发量子技术平台的一条有前途的途径。一个成功的平台需要许多非常接近的量子位交互，以及单独处理每个量子位的能力，而迄今为止，这些要求相互矛盾。陈等人。设计了一种光频域方法，通过该方法，他们能够同时解决许多单独的稀土离子缺陷（此时有六个），并且分离都在控制光的衍射极限内。由于该方法可扩展到数十或数百个缺陷，因此它提供了实现真正大规模量子处理器的前景。科学，这个问题 p。592 一种光频域方法用于同时相干操纵几个稀土离子量子位。固态自旋缺陷是量子科学和技术的一个有前途的平台。具有固态缺陷的更大规模量子系统的实现将需要对具有纳米级分离的多个缺陷进行高保真控制，具有用于多量子位逻辑操作的强自旋-自旋相互作用和纠缠态的创建。我们展示了一种光频域复用技术，允许在单个硅光子晶体腔的亚波长体积内对六个稀土 (Er3+) 离子进行高保真初始化和单次自旋测量。我们还通过使用光学 AC 斯塔克位移演示了对相干自旋旋转的亚波长控制。