Hybrid double-dot qubit measurement with a quantum point contact

doi:10.1088/1674-1056/23/10/100303

Abstract We present the measurement of a hybrid double-dot qubit using a quantum point contact (QPC). To study the dynamics, we derive the rate equations of the entire system. Numerical results show that QPC current can directly reflect the evolution of the qubit. By adjusting Coulomb interaction, energy mismatch, and QPC tunneling rate, the efficiency and dephasing time can be improved. In addition, the initial state with a hybrid triplet state is superior to that with the purely triplet states on the efficiency. Moreover, the decoherence time is estimated on the magnitude of a microsecond, long enough to implement quantum operations.

Keywords: measurement dynamics dephasing

Received: 30 April 2014
Revised: 19 May 2014
Accepted manuscript online:

PACS:	03.65.Yz	(Decoherence; open systems; quantum statistical methods)
	03.67.Lx	(Quantum computation architectures and implementations)
	73.63.Kv	(Quantum dots)

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; 73.63.Kv

Cite this article:

Yan Lei (严蕾), Yin Wen (殷雯), Wang Fang-Wei (王芳卫) Hybrid double-dot qubit measurement with a quantum point contact 2014 Chin. Phys. B 23 100303


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