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arXiv 1807.04075quant-phcond-mat.mes-hallcond-mat.supr-con
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单光子与磁涡旋的强耦合

Strong coupling of a single photon to a magnetic vortex

María José Martínez-Pérez, David Zueco

备注：
published version
发表信息：
ACS Photonics, 6 630 (2019)
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摘要：

强的光-物质耦合是量子信息协议交换信息的必要条件。它用于通过量子总线（光子）耦合不同的量子位（物质）或传递不同类型的激发，例如光与声子或磁振子之间的转换。一个未探索的，到目前为止，接口是光和拓扑保护粒子之间的耦合，如磁畴壁，skyrmions或涡旋的激发。在这里，我们从理论上表明，一个单光子生活在一个超导腔可以强烈耦合到一个纳米盘中的磁涡旋的回旋模式。我们结合数值和分析计算超导共面波导谐振器和不同实现的纳米盘（材料和尺寸）。我们表明，为了提高耦合，在谐振器中制造的收缩是有益的，允许达到强耦合的CoFe光盘半径$200-400$ nm具有几GHz的谐振频率。强耦合制度允许相干地交换单个光子和涡旋激发的量子。因此，我们的计算表明，这里提出的设备作为光子和旋转涡旋之间的换能器，开辟了补充超导量子位与拓扑保护的自旋激发，如涡旋或skyrmions。最后，我们讨论了利用涡旋作为短波长磁振子发射体在量子数据处理中的潜在应用。

英文摘要：

Strong light-matter coupling is a necessary condition for exchanging information in quantum information protocols. It is used to couple different qubits (matter) via a quantum bus (photons) or to communicate different type of excitations, e.g. transducing between light and phonons or magnons. An unexplored, so far, interface is the coupling between light and topologically protected particle like excitations as magnetic domain walls, skyrmions or vortices. Here, we show theoretically that a single photon living in a superconducting cavity can be coupled strongly to the gyrotropic mode of a magnetic vortex in a nanodisc. We combine numerical and analytical calculations for a superconducting coplanar waveguide resonator and different realizations of the nanodisc (materials and sizes). We show that, for enhancing the coupling, constrictions fabricated in the resonator are beneficial, allowing to reach the strong coupling in CoFe discs of radius $200-400$ nm having resonance frequencies of few GHz. The strong coupling regime permits to exchange coherently a single photon and quanta of vortex excitations. Thus, our calculations show that the device proposed here serves as a transducer between photons and gyrating vortices, opening the way to complement superconducting qubits with topologically protected spin-excitations like vortices or skyrmions. We finish by discussing potential applications in quantum data processing based on the exploitation of the vortex as a short-wavelength magnon emitter.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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