The Tightness of Multipartite Coherence from Spectrum Estimation.

The Tightness of Multipartite Coherence from Spectrum Estimation.
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DOI:
10.3390/e23111519
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发表时间:
2021-11-15
期刊:
Entropy (Basel, Switzerland)
影响因子:
--
通讯作者:
Lu H
Lu H
中科院分区:
其他
文献类型:
--
作者:
Ding QM;Fang XX;Lu H

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检测多体量子相干性通常需要量子态重构,这对于大规模量子系统是相当低效的。沿着这条研究路线,人们提出了几种有效的方法来检测多体量子相干性而无需量子态重构,其中基于谱估计的方法适用于各种相干性测度。在这里,我们首先推广了基于谱估计的几何相干性度量方法。然后,我们研究了各种相干性测度的估计下界的紧性,包括相干性的几何测度,相干性的-范数,相干性的鲁棒性,以及相干多量子比特GHZ态和线性团簇态的一些凸屋顶量词。最后,我们展示了基于谱估计的方法以及其他两个有效的方法。我们观察到,基于频谱估计的方法优于其他方法在各种相干措施,这显着提高了估计的准确性。
Detecting multipartite quantum coherence usually requires quantum state reconstruction, which is quite inefficient for large-scale quantum systems. Along this line of research, several efficient procedures have been proposed to detect multipartite quantum coherence without quantum state reconstruction, among which the spectrum-estimation-based method is suitable for various coherence measures. Here, we first generalize the spectrum-estimation-based method for the geometric measure of coherence. Then, we investigate the tightness of the estimated lower bound of various coherence measures, including the geometric measure of coherence, the -norm of coherence, the robustness of coherence, and some convex roof quantifiers of coherence multiqubit GHZ states and linear cluster states. Finally, we demonstrate the spectrum-estimation-based method as well as the other two efficient methods. We observe that the spectrum-estimation-based method outperforms other methods in various coherence measures, which significantly enhances the accuracy of estimation.
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