论文标题
灯孔闸门定义的自旋轨值
Light-Hole Gate-Defined Spin-Orbit Qubit
论文作者
论文摘要
通过引入一个低维系统，该系统由高度拉伸的GE量子井组成，从而实现了在电动偶极旋转谐振下的超快栅极定义的自旋值的设计，从而证明了光孔（LHS）的选择性限制。映射了与量子尺寸相关的$ g $ - 因子和偶极力矩，并讨论了引起其调制的参数。发现LH Qubit偶极矩比规范重孔量子位高2至3个数量级。这种行为源于LHS独特的大三次和线性Rashba旋转轨道相互作用的合并作用所产生的显着自旋分裂。量子释放率也受强旋轨相互作用的影响，通常遵循$ b^7 $的行为。提出的全组直接带隙LH Qubit为远程纠缠分布和量子网络寻求的可伸缩光值光子界面提供了有效的平台。
The selective confinement of light-holes (LHs) is demonstrated by introducing a low-dimensional system consisting of highly tensile-strained Ge quantum well enabling the design of an ultrafast gate-defined spin qubit under the electric dipole spin resonance. The qubit size-dependent $g$-factor and dipole moment are mapped, and the parameters inducing their modulation are discussed. It is found that the LH qubit dipole moment is 2 to 3 orders of magnitude higher than that of the canonical heavy-hole qubit. This behavior originates from the significant spin splitting resulting from the combined action of large cubic and linear Rashba spin-orbit interactions that are peculiar to LHs. The qubit relaxation rate is also affected by the strong spin-orbit interaction and follows typically a $B^7$ behavior. The proposed all-group IV, direct bandgap LH qubit provides an effective platform for a scalable qubit-optical photon interface sought-after for long-range entanglement distribution and quantum networks.
