Local measurement of the entanglement between two quantum-dot qubits

被引：6

作者：

Liu, Jin ^{[1
]}

Jiang, Zhao-Tan ^{[1
,2
]}

Shao, Bin ^{[1
]}

机构：

[1] Beijing Inst Technol, Dept Phys, Beijing 100081, Peoples R China

[2] Abdus Salam Int Ctr Theoret Phys, I-34014 Trieste, Italy

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 11期

关键词：

quantum computing; quantum dots; quantum entanglement; quantum point contacts; SEPARABILITY; DETECTOR;

D O I：

10.1103/PhysRevB.79.115323

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using the modified rate equation the local measurement of the entanglement between two quantum-dot qubits, with two isolated quantum-point-contact detectors, is investigated. It is shown that the measurement process will induce the decaying of the two-qubit entanglement, as well as the electron-occupation probabilities. Furthermore, we find an effective scheme to measure the two-qubit entanglement based on the local measurement. It is demonstrated that the entanglement between the two qubits coupled by the strong Coulomb interaction can be fully extracted according to the time-dependent variation rate of the detector current.

引用

页数：6

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