Entanglement in a three spin system controlled by electric and magnetic fields

被引：16

作者：

Luczak, Jakub ^{[1
]}

Bulka, Bogdan R. ^{[1
]}

机构：

[1] Polish Acad Sci, Inst Mol Phys, PL-60179 Poznan, Poland

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2012年 / 24卷 / 37期

关键词：

QUANTUM COMPUTATION; MANIPULATION; STATES;

D O I：

10.1088/0953-8984/24/37/375303

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We study the effect of electric field and magnetic flux on spin entanglement in an artificial triangular molecule built of coherently coupled quantum dots. In a subspace of doublet states an explicit relation of concurrence with spin correlation functions and chirality is presented. The electric field modifies superexchange correlations and shifts many-electron levels (the Stark effect), as well as changing spin correlations. For some specific orientation of the electric field one can observe monogamy, for which one of the spins is separated from two others. Moreover, the Stark effect manifests itself in a different spin entanglement for small and strong electric fields. The role of magnetic flux is opposite: it leads to circulation of spin supercurrents and spin delocalization.

引用

页数：7

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