Tomographic entanglement indicators in frequency combs and Talbot carpets
Tomographic entanglement indicators in frequency combs and Talbot carpets
复制标题
频率梳和塔尔博特地毯中的层析纠缠指示器
DOI：
10.1088/1361-6455/ac870d
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Sharmila B
中科院分区：
文献类型：
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作者：
Sharmila B
近年来对层析纠缠指标的理论研究显示了层析方法在连续变量（CV）、自旋和混合量子系统中的优势。利用IBM量子计算平台和核磁共振实验的实验数据直接估计纠缠也在早期的工作中进行了。在CV系统的背景下进行类似的调查是必要的，以充分评估层析成像方法的效用。在本文中，我们在文献中报道的两个CV系统（即纠缠塔尔博特地毯和纠缠双光子频率梳）的实验背景下强调了这种方法的优点。我们使用层析缠结指示器来估计一对塔尔博特地毯之间的缠结程度，并证明与实验中建议的程序相比，这提供了一个更简单、更直接的程序。我们还建立了对应于两个双光子频率梳的层析图具有区分两种状态的清晰纠缠特征。
Recent theoretical investigations on tomographic entanglement indicators have showcased the advantages of the tomographic approach in the context of continuous-variable (CV), spin and hybrid quantum systems. Direct estimation of entanglement using experimental data from the IBM quantum computing platform and NMR experiments has also been carried out in earlier work. A similar investigation in the context of CV systems is necessary to assess fully the utility of the tomographic approach. In this paper, we highlight the advantages of this approach in the context of experiments reported in the literature on two CV systems, namely, entangled Talbot carpets and entangled biphoton frequency combs. We use the tomographic entanglement indicator to estimate the degree of entanglement between a pair of Talbot carpets, and demonstrate that this provides a simpler and more direct procedure as compared to the one suggested in the experiment. We also establish that the tomograms corresponding to two biphoton frequency combs carry clear entanglement signatures that distinguish between the two states.