电磁选择定则与通过表面声子波声子对量子斯格明子的相干操控
Electromagnetic Selection Rules and Coherent Manipulation of Quantum Skyrmion via Surface Acoustic Wave Phonons
- School of Integrated Circuits, Tsinghua University（清华大学集成电路学院）
- Frontier Science Center for Quantum Information（量子信息前沿科学中心）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究通过表面声波声子实现量子斯格明子的相干操控，揭示了电磁选择定则，并发现耦合强度随斯格明子半径线性增强，为混合量子信息处理提供了紧凑构建模块。
AI中文摘要：
斯格明子是信息存储单元的有力候选者，并在量子信息处理中具有巨大前景。我们在此研究在压电表面声波腔中通过表面声波声子对量子斯格明子的相干控制。对有限Dzyaloshinskii-Moriya团簇的精确对角化揭示了具有鲁棒标量手性的量子斯格明子的本征态。潜在的晶格自旋对称性对本征态之间的电磁跃迁施加了依赖于极化的选择定则。考虑到表面声波声子的小模体积易于实现强耦合，我们通过压电效应感应的电场推导了作为量子比特的量子斯格明子与单模量子化表面声波之间的相互作用哈密顿量，并发现单声子水平的耦合强度随斯格明子半径线性增加。这为更大的斯格明子纹理和低磁耗散实现了增强的自旋-声学耦合。我们的结果确立了少自旋量子斯格明子作为混合量子信息处理的紧凑构建模块，并为更密集集成的片上量子器件提供了一条途径。
英文摘要：
Skyrmions are competitive candidates for information-storage units and have great prospect in quantum information processing. We here study coherent control of a quantum skyrmion via surface acoustic wave (SAW) phonons in a piezoelectric SAW cavity. Exact diagonalization of a finite Dzyaloshinskii-Moriya cluster reveals the eigenstates of quantum skyrmion with robust scalar chirality. The underlying lattice-spin symmetry imposes polarization-dependent selection rules for the electromagnetic transitions between eigenstates states. Considering the small mode volume of the SAW phonon easy to reach strong coupling, we derive the interaction Hamiltonian between the quantum skyrmion as a qubit and a single-mode quantized SAW via the electric field induced by piezoelectric effect, and find that the coupling strength at the single-phonon level increases linearly with skyrmion radius. This enables enhanced spin-acoustic coupling for larger skyrmionic textures and for low magnetic dissipation. Our results establish few-spin quantum skyrmions as compact building blocks for hybrid quantum information processing and suggest a route toward more densely integrated on-chip quantum devices.
