论文标题

通过投影测量的贝尔非局部性实验性回收

Experimental recycling of Bell nonlocality with projective measurements

论文作者

Xiao, Ya, Rong, Yan-Xin, Han, Xin-Hong, Wang, Shuo, Fan, Xuan, Li, Wei-Chen, Gu, Yong-Jian

论文摘要

作为节省量子资源的一种方式,已经对贝尔非局部性的回收进行了实验研究,但仅限于顺序的UNSHARP测量。但是,从理论上讲,最近表明,投射测量足以回收非局部性[Phys。莱特牧师。 \ textbf {129},230402(2022)]。在这里,我们超越了UNSHAP测量场景,并通过投影测量实验证明了非本地资源的回收。通过验证违反clauser-horne shimony-holt(CHSH)的不平等现象,我们发现三个独立的当事方可以回收两数分状态的钟声,无论它是最大还是部分纠缠。此外,在双重违规区域中,部分纠缠状态的最佳权衡可以比最大纠缠的州更好的11个标准偏差。我们的结果在实验上消除了常见的误解,即投影测量与量子相关性的回收不相容。此外,我们的非局部回收设置不需要纠缠辅助,这在实验上更加友好,因此为重复使用其他类型的量子相关性铺平了道路。

As a way of saving quantum resources, recycling of Bell nonlocality has been experimentally studied, but restricted to sequential unsharp measurements. However, it has been theoretically shown recently that projective measurements are sufficient for recycling nonlocality [Phys. Rev. Lett. \textbf{129}, 230402 (2022)]. Here, we go beyond unsharp measurement scenarios and experimentally demonstrate the recycling of nonlocal resources with projective measurements. By verifying the violation of Clauser-Horne-Shimony-Holt (CHSH) inequality, we find that three independent parties can recycle the Bell nonlocality of a two-qubit state, whether it is maximally or partially entangled. Furthermore, in the double violation region, the optimal trade-off for partially entangled states can be 11 standard deviations better than that for maximally entangled states. Our results experimentally eliminate the common misconception that projective measurements are incompatible with the recycling of quantum correlations. In addition, our nonlocality recycling setup does not require entanglement assistance, which is much more experimentally friendly, thus paving the way for the reuse of other kinds of quantum correlations.

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