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arXiv 1205.1968quant-ph
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高维双光子轨道angular momentum纠缠的维数增加

Increasing the dimension in high-dimensional two-photon orbital angular momentum entanglement

J. Romero, D. Giovannini, S. Franke-Anold, S. M. Barnett, M. J. Padgett

摘要:

利用光子轨道角动量(OAM)状态空间的固有D维纠缠的任何实际实验都受到检测系统的模式容量的影响。我们表明,给定这样的约束,测量,纠缠OAM模式的数目在光子对产生的自发参量下转换(SPDC)可以最大限度地调整相位匹配条件的SPDC过程中。我们证明了OAM相关谱的半宽增加了2倍,从10增加到20,后者意味着\approx 50维双光子OAM纠缠。利用相关性的共轭变量,角位置,我们测量并发值0.96和0.90的两个相位匹配条件,表示二分,D维纠缠,其中D是可调的。

英文摘要:

Any practical experiment utilising the innate D-dimensional entanglement of the orbital angular momentum (OAM) state space of photons is subject to the modal capacity of the detection system. We show that given such a constraint, the number of measured, entangled OAM modes in photon pairs generated by spontaneous parametric down-conversion (SPDC) can be maximised by tuning the phase-matching conditions in the SPDC process. We demonstrate a factor of 2 increase on the half-width of the OAM-correlation spectrum, from 10 to 20, the latter implying \approx 50 -dimensional two-photon OAM entanglement. Exploiting correlations in the conjugate variable, angular position, we measure concurrence values 0.96 and 0.90 for two phase-matching conditions, indicating bipartite, D-dimensional entanglement where D is tuneable.

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