Proposal for optical U(1) rotations of electron spin trapped in a quantum dot
Proposal for optical U(1) rotations of electron spin trapped in a quantum dot
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DOI：
10.1103/physrevb.74.205415
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发表时间：
2006-11-01
影响因子：
3.7
通讯作者：
Steel, D. G.
中科院分区：
文献类型：
--
作者：
Economou, Sophia E.;Sham, L. J.;Steel, D. G.
我们提出了一个建议，以光学方式实现的电子自旋在量子点的生长方向（z轴）的旋转。特别地，我们利用二能级系统中sech脉冲的解析性质，实现了自旋绕生长方向任意角度的旋转，并给出了解析表达式。我们建议使用这个方案来实验证明这种自旋旋转。使用现实的系统和脉冲参数，我们发现旋转的保真度超过96%的脉冲在皮秒制度，并对脉冲参数的小误差鲁棒。我们设计了一个反馈（自适应）环路，以纠正错误源于意外的动态。旋转仍然是明显的，尽管有很大的保真度损失，在合奏的情况下，提供了可能性的演示这种光学自旋旋转的量子点合奏。
We present a proposal to optically implement rotations of the electron spin in a quantum dot about the growth direction (z axis). In particular, we make use of the analytic properties of sech pulses in two-level systems to realize spin rotations about the growth direction by an arbitrary angle, for which we give an analytical expression. We propose to use this scheme to experimentally demonstrate this spin rotation. Using realistic system and pulse parameters we find the fidelity of the rotation to be more than 96% for pulses in the picosecond regime, and robust against small errors in pulse parameters. We design a feedback (adaptive) loop to correct for errors originating from unintended dynamics. The rotation is still evident-albeit with a large fidelity loss-in the ensemble case, providing the possibility of demonstration of this optical spin rotation in an ensemble of quantum dots.