发表机构
Consejo Superior de Investigaciones Científicas (CSIC); Quantum Advanced Research Center (QuARC); Instituto de Ciencia de Materiales de Madrid (ICMM)（西班牙国家研究委员会; 量子先进研究中心; 马德里材料科学研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出自旋声学手性概念，通过门控调节点限制实现表面声波对空穴自旋的定向控制，并展示了其在双色相干保护和贝尔态初始化中的应用。
AI 中文摘要
门定义的空穴自旋结合了强自旋轨道耦合与卓越的应变敏感性，使得表面声波成为远程、相位相干控制的自然途径。我们证明，相向传播的表面声波在耦合强度以及它们主要驱动自旋旋转还是调制量子比特频率方面可以有所不同。我们将这种横向跃迁强度不平衡称为自旋声学手性，并表明它可以通过栅极控制点限制的重新整形来调节。结合多带Luttinger-Kohn哈密顿量与Bir-Pikus应变描述以及三维压电有限元模拟，我们获得了控制相干SAW驱动的声学g矩阵调制。对相同的应变介导相互作用进行量子化，得到相应的单声子耦合，以及具有共旋、逆旋和纵向分量的广义各向异性Rabi相互作用，将经典手性与量子各向异性和定向单声子发射联系起来。磁场方向和点形状调节声学手性和算符选择性。我们通过双色相干性保护和声子介导的预示贝尔态初始化来展示这一框架。
英文摘要
Gate-defined hole spins combine strong spin-orbit coupling with exceptional strain sensitivity, making surface acoustic waves a natural route to remote, phase-coherent control. We show that counterpropagating surface acoustic waves can differ in coupling strength and in whether they predominantly drive spin rotations or modulate the qubit frequency. We call the transverse transition-strength imbalance spin-acoustic chirality and show that it is tunable through gate-controlled reshaping of the dot confinement. Combining a multiband Luttinger-Kohn Hamiltonian with the Bir-Pikus description of strain and 3D piezoelectric finite-element simulations, we obtain the acoustic g-matrix modulation governing coherent SAW driving. Quantizing the same strain-mediated interaction yields the corresponding single-phonon coupling, and a generalized anisotropic Rabi interaction with co-rotating, counter-rotating, and longitudinal components, linking classical chirality to quantum anisotropy and directional one-phonon emission. Magnetic field orientation and dot shape tune the acoustic chirality and operator selectivity. We illustrate this framework through bichromatic coherence protection and phonon-mediated heralded Bell-state initialization.
Comments24 pages, 6 figures, 2 supporting figures
