Entangled photon pairs from semiconductor quantum dots
Entangled photon pairs from semiconductor quantum dots
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DOI：
10.1103/physrevlett.96.130501
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发表时间：
2006-04-07
影响因子：
8.6
通讯作者：
Petroff, PM
中科院分区：
文献类型：
--
作者：
Akopian, N;Lindner, NH;Petroff, PM
层析分析表明，在进行光谱滤波后，双激子衰减级联发射的光子对的偏振态发生纠缠。测量得到的光子对密度矩阵比实验不确定度高出3个标准差以上，满足Peres纠缠判据，违反Bell不等式。我们表明，光谱滤波消除了包含在光子颜色中的“路径”信息，并且量子点自由度中的剩余信息可以忽略不计。
Tomographic analysis demonstrates that the polarization state of pairs of photons emitted from a biexciton decay cascade becomes entangled when spectral filtering is applied. The measured density matrix of the photon pair satisfies the Peres criterion for entanglement by more than 3 standard deviations of the experimental uncertainty and violates Bell's inequality. We show that the spectral filtering erases the "which path" information contained in the photons' color and that the remanent information in the quantum dot degrees of freedom is negligible.