Effect of Quantum Point Contact Measurement on Electron Spin State in Quantum Dots

Effect of Quantum Point Contact Measurement on Electron Spin State in Quantum Dots
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DOI：
10.1088/0256-307x/26/5/050301
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发表时间：
2009-04
期刊：
Chinese Physics Letters
影响因子：
3.5
通讯作者：
Zhuahg Fei-yun;Tu Tao;Hao Xiao-jie;Guo Guangcan;Guo Guoping
Zhuahg Fei-yun;Tu Tao;Hao Xiao-jie;Guo Guangcan;Guo Guoping
中科院分区：
物理与天体物理3区
文献类型：
--
作者：
Zhuahg Fei-yun;Tu Tao;Hao Xiao-jie;Guo Guangcan;Guo Guoping

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研究了以邻近量子点接触(QPC)为测量装置的双量子点系统中两电子自旋态的时间演化。我们发现QPC测量引起的退相干是在微秒时间尺度上的。我们还发现，增强的QPC测量将捕获系统的初始自旋态，这与量子Zeno效应是一致的。
We study the time evolution of two electron spin states in a double quantum-dot system, which includes a nearby quantum point contact (QPC) as a measurement device. We find that the QPC measurement induced decoherence is in the microsecond timescale. We also find that the enhanced QPC measurement will trap the system in its initial spin states, which is consistent with the quantum Zeno effect.