Coherent control of a single electron spin with electric fields
Coherent control of a single electron spin with electric fields
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DOI：
10.1126/science.1148092
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发表时间：
2007-11-30
期刊：
影响因子：
56.9
通讯作者：
Vandersypen, L. M. K.
中科院分区：
文献类型：
--
作者：
Nowack, K. C.;Koppens, F. H. L.;Vandersypen, L. M. K.
对单自旋的操纵是基于自旋的量子信息处理的关键。对于这一目的，电气控制而不是磁控制特别有吸引力，因为在芯片上很容易在局部产生电场。我们利用局域门产生的振荡电场实现了对量子点中单电子自旋的相干控制。电场诱导了自旋向上和向下之间的相干跃迁(Rabi振荡)，自旋向上和向下的旋转速度为90周，速度类似于55纳秒。我们的分析表明，电致自旋相变是由自旋-轨道相互作用所介导的。结合最近证明的两个相邻自旋的相干交换，我们的结果证实了完全电子操纵自旋量子比特的可行性。
Manipulation of single spins is essential for spin-based quantum information processing. Electrical control instead of magnetic control is particularly appealing for this purpose, because electric fields are easy to generate locally on-chip. We experimentally realized coherent control of a single-electron spin in a quantum dot using an oscillating electric field generated by a local gate. The electric field induced coherent transitions (Rabi oscillations) between spin-up and spin-down with 90 rotations as fast as similar to 55 nanoseconds. Our analysis indicated that the electrically induced spin transitions were mediated by the spin-orbit interaction. Taken together with the recently demonstrated coherent exchange of two neighboring spins, our results establish the feasibility of fully electrical manipulation of spin qubits.