Spin-Orbit Qubit on a Multiferroic Insulator in a Superconducting Resonator
Spin-Orbit Qubit on a Multiferroic Insulator in a Superconducting Resonator
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DOI：
10.1103/physrevb.89.115417
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发表时间：
2013-12
影响因子：
3.7
通讯作者：
P. Zhang;Z. Xiang;F. Nori
中科院分区：
文献类型：
--
作者：
P. Zhang;Z. Xiang;F. Nori
我们提出了一个自旋轨道量子位在纳米线量子点的表面上的多铁性绝缘体与摆线螺旋磁序。来自多铁性绝缘体的螺旋交换场在量子点中的电子自旋上引起非均匀的类塞曼相互作用，产生自旋轨道量子比特。没有外部磁场有利于将这种自旋轨道量子比特集成到高质量的超导谐振器中。通过利用量子点中的Rashba自旋-轨道耦合经由栅极电压，可以获得有效的自旋-光子耦合以及有效的开/关切换。这使得所提出的设备可控，并有望用于混合量子通信。
We propose a spin-orbit qubit in a nanowire quantum dot on the surface of a multiferroic insulator with a cycloidal spiral magnetic order. The spiral exchange field from the multiferroic insulator causes an inhomogeneous Zeeman-like interaction on the electron spin in the quantum dot, producing a spin-orbit qubit. The absence of an external magnetic field benefits the integration of such spin-orbit qubit into high-quality superconducting resonators. By exploiting the Rashba spin-orbit coupling in the quantum dot via a gate voltage, one can obtain an effective spin-photon coupling with an efficient on/off switching. This makes the proposed device controllable and promising for hybrid quantum communications.