Measurements of a periodically driving qubit using a quantum point contact

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 w...

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Bibliographic Details
Published in:Chinese physics B 2010-03, Vol.19 (3), p.51-54
Main Author: 王海霞 殷雯 王芳卫
Format: Article
Language:English
Subjects:
Detectors
Driving
Electron tunneling
Mathematical analysis
Point contact
Qubits (quantum computing)
内聚力
初始状态
速率方程
量子比特
量子点接触
驱动频率
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Summary: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.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/19/3/030308