Fast spin rotations by optically controlled geometric phases in a charge-tunable InAs quantum dot.
Fast spin rotations by optically controlled geometric phases in a charge-tunable InAs quantum dot.
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DOI：
10.1103/physrevlett.104.167401
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发表时间：
2009-10
影响因子：
8.6
通讯作者：
Erik D. Kim;K. Truex;Xiaodong Xu;Bosong Sun;D. Steel;A. Bracker;D. Gammon;L. Sham
中科院分区：
文献类型：
--
作者：
Erik D. Kim;K. Truex;Xiaodong Xu;Bosong Sun;D. Steel;A. Bracker;D. Gammon;L. Sham
我们演示了通过点中光学跃迁的循环2 pi激发，对限制在电荷可调InAs量子点中的电子的一个自旋态获得的几何相位进行光学控制。在存在恒定的面内磁场的情况下，这些光学诱导的几何相位导致自旋围绕磁场轴的有效旋转，并且表现为由两个时间延迟的圆偏振光脉冲产生的自旋量子拍频信号中的相移。以这种方式产生的几何相位更一般地执行自旋相位门的作用，证明对量子信息应用可能有用。
We demonstrate optical control of the geometric phase acquired by one of the spin states of an electron confined in a charge-tunable InAs quantum dot via cyclic 2pi excitations of an optical transition in the dot. In the presence of a constant in-plane magnetic field, these optically induced geometric phases result in the effective rotation of the spin about the magnetic field axis and manifest as phase shifts in the spin quantum beat signal generated by two time-delayed circularly polarized optical pulses. The geometric phases generated in this manner more generally perform the role of a spin phase gate, proving potentially useful for quantum information applications.