Strong coupling among semiconductor quantum dots induced by a metal nanoparticle

被引：45
作者：
He, Yong [1 ]
Zhu, Ka-Di [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Dept Phys, Minist Educ, Key Lab Artificial Struct & Quantum Control, Shanghai 200240, Peoples R China
来源：
NANOSCALE RESEARCH LETTERS | 2012年 / 7卷
基金：
中国国家自然科学基金;
关键词：
ENTANGLEMENT; PLASMONS; EXCITONS; QUBITS;
D O I：
10.1186/1556-276X-7-95
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Based on cavity quantum electrodynamics (QED), we investigate the light-matter interaction between surface plasmon polaritons (SPP) in a metal nanoparticle (MNP) and the excitons in semiconductor quantum dots (SQDs) in an SQD-MNP coupled system. We propose a quantum transformation method to strongly reveal the exciton energy shift and the modified decay rate of SQD as well as the coupling among SQDs. To obtain these parameters, a simple system composed of an SQD, an MNP, and a weak signal light is designed. Furthermore, we consider a model to demonstrate the coupling of two SQDs mediated by SPP field under two cases. It is shown that two SQDs can be entangled in the presence of MNP. A high concurrence can be achieved, which is the best evidence that the coupling among SQDs induced by SPP field in MNP. This scheme may have the potential applications in all-optical plasmon-enhanced nanoscale devices.
引用
收藏
页码：1 / 6
页数：6
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