Quantum state measurement in double quantum dots with a radio-frequency quantum point contact

doi:10.1088/1674-1056/23/2/020305

Abstract We study the dynamics of two electron spins in coupled quantum dots (CQDs) monitored by a quantum point contact (QPC) detector. Their quantum state can be measured by embedding the QPC in an LC circuit. We derive the Bloch-type rate equations of the reduced density matrix for CQDs. Special attention is paid to the numerical results for the weak measurement condintion under a strong Coulomb interaction. It is shown that the evolution of QPC current always follows that of electron occupation in the right dot. In addition, we find that the output voltage of the circuit can reflect the evolution of QPC current when the circuit and QPC are approximately equal in frequency. In particular, the wave shape of the output voltage can be improved by adjusting the circuit resonance frequency and bandwidth.

Keywords: measurement quantum state output voltage circuit parameter

Received: 13 August 2013
Revised: 12 September 2013
Accepted manuscript online:

PACS:	03.65.Yz	(Decoherence; open systems; quantum statistical methods)
	03.67.Lx	(Quantum computation architectures and implementations)
	73.23.Hk	(Coulomb blockade; single-electron tunneling)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11174358) and the National Basic Research Program of China (Grant No. 2010CB833102).

Corresponding Authors: Yin Wen
E-mail: wenyin@aphy.iphy.ac.cn

About author: 03.65.Yz; 03.67.Lx; 73.23.Hk

Cite this article:

Yan Lei (严蕾), Wang Hai-Xia (王海霞), Yin Wen (殷雯), Wang Fang-Wei (王芳卫) Quantum state measurement in double quantum dots with a radio-frequency quantum point contact 2014 Chin. Phys. B 23 020305

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