Measurements of a periodically driving qubit using a quantum point contact  

作　　者：王海霞 殷雯 王芳卫 

机构地区：[1]Institute of Physics,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2010年第3期51-54,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 10775091)

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.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.

关 键 词：periodically driving qubit MEASUREMENT detector current driving frequency 

分 类 号：O471.1[理学—半导体物理] TP38[理学—物理]