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Effect of Quantum Point Contact Measurement on Electron Spin State in Quantum Dots |
| ZHU Fei-Yun, TU Tao, HAO Xiao-Jie, GUO Guang-Can, GUO Guo-Ping |
| Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026 |
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| Cite this article: |
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ZHU Fei-Yun, TU Tao, HAO Xiao-Jie et al 2009 Chin. Phys. Lett. 26 050301 |
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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 micrsecond 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.
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| Keywords:
03.67.Lx
03.65.Yz
03.65.Ta
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Received: 12 January 2009
Published: 23 April 2009
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| PACS: |
03.67.Lx
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(Quantum computation architectures and implementations)
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03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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03.65.Ta
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(Foundations of quantum mechanics; measurement theory)
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