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

• 作 者: ZHU Fei-Yun TU Tao HAO Xiao-Jie GUO Guang-Can GUO Guo-Ping
• 机 构: Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026
• 出 处: 中国物理快报（英文版）
• 发表日期: 2009年5期

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.