论文标题
带有周期性潜力的Rashba环上的量子转换
Qubit transformations on Rashba ring with periodic potential
论文作者
论文摘要
提出了一种旋转量转换方案，该方案是针对由外部电场控制的介质量子环中的电子的。通过分析确定，通过一系列有限数量的局部电压门之间的类似Landau-Zenner的过渡，可以通过分析确定电子驱动的电子动力学。在局部伪旋转状态的动态基础上，总体单量转换被证明是可行的。还证明，通过使用基于Rashba相互作用的变化，可以涵盖完整的Bloch球体的合适协议。讨论了半导体异质结构中提出的系统可能实现的挑战。
A spin-qubit transformation protocol is proposed for an electron in a mesoscopic quantum ring with tunable Rashba interaction controlled by the external electric field. The dynamics of an electron driven around the ring by a series of Landau-Zenner-like transitions between a finite number of local voltage gates is determined analytically. General single-qubit transformations are demonstrated to be feasible in a dynamical basis of localized pseudo-spin states. It is also demonstrated that by the use of suitable protocols based on changes of the Rashba interaction full Bloch sphere can be covered. The challenges of a possible realization of the proposed system in semiconductor heterostructures are discussed.
