| 激子自旋弛豫对简并量子点发射光子对纠缠度的影响 |
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| 引用本文： | 刘绍鼎,程木田,王霞,王取泉.激子自旋弛豫对简并量子点发射光子对纠缠度的影响[J].物理学报,2007,56(8):4924-4929. |
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| 作者姓名： | 刘绍鼎 程木田 王霞 王取泉 |
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| 作者单位： | (1)武汉大学物理系，武汉 430072; (2)武汉大学物理系，武汉 430072;武汉大学声光材料与器件教育部重点实验室，武汉 430072 |
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| 摘 要： | 利用粒子数运动方程和量子回归理论，计算了单个半导体量子点双激子体系脉冲激发下粒子在各能级间辐射跃迁的二阶交叉相关函数以及系统发射光子对的偏振密度矩阵.分析了激子态能级简并量子点体系发射光子对偏振纠缠特性，讨论了纠缠度随激子态间自旋弛豫的变化关系.研究表明，激子自旋弛豫会破坏该系统发射光子对的纠缠度.
关键词：
纠缠光子对
半导体量子点
二阶相关函数
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| 关 键 词： | 纠缠光子对 半导体量子点 二阶相关函数 |
| 文章编号： | 1000-3290/2007/56(08)/4924-06 |
| 收稿时间： | 2006-12-04 |
| 修稿时间： | 2006-12-04 |
The influence of spin relaxation on the entanglement of photon pairs emitted from degenerate exciton quantum dot system |
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| Liu Shao-Ding,Cheng Mu-Tian,Wang Xia,Wang Qu-Quan.The influence of spin relaxation on the entanglement of photon pairs emitted from degenerate exciton quantum dot system[J].Acta Physica Sinica,2007,56(8):4924-4929. |
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| Authors: | Liu Shao-Ding Cheng Mu-Tian Wang Xia Wang Qu-Quan |
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| Institution: | 1.Department of Physies , Wuhan University, Wuhan 430072, China;2.Key Laboratory of Acoustic and Phatonic Materials and Devices of Ministry of Education, Wuhan University, Wuhan 430072,China |
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| Abstract: | The second-order cross correlation function of the photon emission and the polarization density matrix of the photon pairs emitted from the biexciton system of single semiconductor quantum dots under pulsed excitation were calculated using the dynamical population density matrix equations and quantum regression theorem. The entanglement of the photon pairs emitted from the single quantum dot with degenerate exciton states were investigated, and the relationship between the entanglement and the spin relaxation rate was also discussed. The simulations revealed that the spin relaxation destroys the entanglement of the photon pairs emitted from this system. |
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| Keywords: | entangled photon pairs semiconductor quantum dot second-order correlation function |
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