Measurements of a periodically driving qubit using a quantum point contact

doi:10.1088/1674-1056/19/3/030308

中国物理B ›› 2010, Vol. 19 ›› Issue (3): 30308-030308.doi: 10.1088/1674-1056/19/3/030308

Measurements of a periodically driving qubit using a quantum point contact

王海霞, 殷雯, 王芳卫

Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2009-06-02 修回日期:2009-08-24 出版日期:2010-03-15 发布日期:2010-03-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No.~10775091).

Measurements of a periodically driving qubit using a quantum point contact

Wang Hai-Xia (王海霞), Yin Wen(殷雯)^†, and Wang Fang-Wei(王芳卫)

Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2009-06-02 Revised:2009-08-24 Online:2010-03-15 Published:2010-03-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No.~10775091).

摘要/Abstract

摘要： Using the method developed by Gurvitz [1996 Phys. Rev. B 53 15932], we obtained the Bloch-type rate equations describing the entire system of a periodically driving qubit monitored by a quantum point contact detector. The results demonstrate that the isolated qubit can be kept in its initial state with a large driving frequency due to more difficult electron tunneling in qubit, and this initial state can always be measured at a small measurement-induced decoherence rate during a short time.

Abstract: Using the method developed by Gurvitz [1996 Phys. Rev. B 53 15932], we obtained the Bloch-type rate equations describing the entire system of a periodically driving qubit monitored by a quantum point contact detector. The results demonstrate that the isolated qubit can be kept in its initial state with a large driving frequency due to more difficult electron tunneling in qubit, and this initial state can always be measured at a small measurement-induced decoherence rate during a short time.

Key words: periodically driving qubit, measurement, detector current, driving frequency

中图分类号: (Electronic transport in mesoscopic systems)

73.23.-b

73.40.Gk (Tunneling)

王海霞, 殷雯, 王芳卫. Measurements of a periodically driving qubit using a quantum point contact[J]. 中国物理B, 2010, 19(3): 30308-030308.

Wang Hai-Xia (王海霞), Yin Wen(殷雯), and Wang Fang-Wei(王芳卫). Measurements of a periodically driving qubit using a quantum point contact[J]. Chin. Phys. B, 2010, 19(3): 30308-030308.

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Measurements of a periodically driving qubit using a quantum point contact

Measurements of a periodically driving qubit using a quantum point contact

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