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GENERAL

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

Zhu Fei-Yun et al 2009 Chinese Phys. Lett. 26 050301 (4pp)   doi: 10.1088/0256-307X/26/5/050301  Help

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Zhu Fei-Yun1, Tu Tao1, Hao Xiao-Jie1, Guo Guang-Can1 and Guo Guo-Ping1
1 Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026
E-mail: tutao@ustc.edu.cn (Tu Tao) and gpguo@ustc.edu.cn (Guo Guo-Ping)

Abstract. 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.

PACS numbers: 03.67.Lx, 03.65.Yz, 03.65.Ta

Print publication: Issue 5 (May 2009)
Received 12 January 2009

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