Analytical solution of the quantum-state tomography of the biexciton cascade in semiconductor quantum dots: Pure dephasing does not affect entanglement
Analytical solution of the quantum-state tomography of the biexciton cascade in semiconductor quantum dots: Pure dephasing does not affect entanglement
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DOI：
10.1103/physrevb.84.075328
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发表时间：
2011-08-15
影响因子：
3.7
通讯作者：
Knorr, Andreas
中科院分区：
文献类型：
--
作者：
Carmele, Alexander;Knorr, Andreas
半导体量子点中的双激子级联是从固态器件中产生偏振纠缠光子对的基本方法。为了在弱耦合状态下有效地产生光子对，我们提出了双光子矩阵元素（量子态层析）的解析解，包括消相和弛豫机制。特别是，我们证明了纯消相机制不会影响具有退化激子水平的量子点的纠缠度。
A fundamental approach to generate polarization-entangled photon pairs from solid-state devices is the biexciton cascade in semiconductor quantum dots. For efficient photon pair generation in the weak coupling regime, we present an analytical solution for the two-photon matrix elements (quantum-state tomography), including dephasing and relaxation mechanisms. In particular, we show that a pure dephasing mechanism does not affect the degree of entanglement for quantum dots with degenerated exciton levels.