该研究团队通过实验成功地确定了磁振子诱导的NV中心自能以及磁振子介导的NV-NV耦合。研究结果表明，这种耦合的数量级与NV中心通过偶极相互作用与磁振子耦合的模型相一致。这一发现提供了一种多功能的工具，用于表征缺乏强耦合的混合量子系统，为未来设计纠缠固体系统提供了宝贵的信息。
据悉，局域和非局域固体自旋系统之间的受控相互作用为用量子自旋电子学处理片上量子信息提供了一个引人注目的平台。金刚石中的定域氮空位(NV)中心和铁磁体中的离域磁子模式的混合量子系统(HQSs)具有自然相称的能量，最近受到广泛关注，特别是在远超过偶极耦合设定的长度尺度上相互连接孤立的自旋量子比特。然而，尽管广泛的理论努力，仍缺乏对NV中心之间磁振子介导的相互作用的实验表征，这是开发这种混合量子体系结构所必需的。
附：英文原文
Title: Magnon-mediated qubit coupling determined via dissipation measurements
Author: Fukami, Masaya, Marcks, Jonathan C., Candido, Denis R., Weiss, Leah R., Soloway, Benjamin, Sullivan, Sean E., Delegan, Nazar, Heremans, F. Joseph, Flatté, Michael E., Awschalom, David D.
Issue&Volume: 2024-1-3
Abstract: Controlled interaction between localized and delocalized solid-state spin systems offers a compelling platform for on-chip quantum information processing with quantum spintronics. Hybrid quantum systems (HQSs) of localized nitrogen-vacancy (NV) centers in diamond and delocalized magnon modes in ferrimagnets—systems with naturally commensurate energies—have recently attracted significant attention, especially for interconnecting isolated spin qubits at length-scales far beyond those set by the dipolar coupling. However, despite extensive theoretical efforts, there is a lack of experimental characterization of the magnon-mediated interaction between NV centers, which is necessary to develop such hybrid quantum architectures. Here, we experimentally determine the magnon-mediated NV–NV coupling from the magnon-induced self-energy of NV centers. Our results are quantitatively consistent with a model in which the NV center is coupled to magnons by dipolar interactions. This work provides a versatile tool to characterize HQSs in the absence of strong coupling, informing future efforts to engineer entangled solid-state systems.
DOI: 10.1073/pnas.2313754120
Source: https://www.pnas.org/doi/abs/10.1073/pnas.2313754120