Angle-dependent decoherence of charge qubits in free-standing slabs

被引：0

作者：

Liao, Ying-Yen ^{[1
]}

Chen, Yueh-Nan ^{[2
,3
]}

Jian, Sheng-Rui ^{[4
]}

机构：

[1] Natl Univ Kaohsiung, Dept Appl Phys, Kaohsiung 811, Taiwan

[2] Natl Cheng Kung Univ, Natl Ctr Theoret Sci, Tainan 701, Taiwan

[3] Natl Cheng Kung Univ, Dept Phys, Tainan 701, Taiwan

[4] I Shou Univ, Dept Mat Sci & Engn, Kaohsiung 840, Taiwan

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2010年 / 22卷 / 04期

关键词：

QUANTUM DOTS; DYNAMICS; SYSTEM; WIRES;

D O I：

10.1088/0953-8984/22/4/045301

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We investigate the decoherence of a charge qubit in a double quantum dot which is formed in a free-standing semiconductor slab. The dots are spatially arranged to align along a particular direction. Confined phonons in the slab have a remarkable influence on the dynamics of a qubit system. We show that the decoherence of such a qubit strongly depends on the positions of the dots. By varying the tunnel coupling, the decoherence differs significantly in laterally and vertically coupled quantum dots. A robust qubit is further achieved due to suppression of electron-phonon coupling. Moreover, the coherent evolution of the system is analyzed by modulating the interdot direction.

引用

页数：6

共 38 条

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