arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.10069quant-ph
收藏

具有CASTO图后选择的真实多部非定域性

Genuine multipartite nonlocality with causal-diagram postselection

Valentin Gebhart, Luca Pezzè, Augusto Smerzi

摘要:

真实多体非局域性(GMN)的产生和验证是基础研究和量子技术应用(如量子隐私)的核心兴趣。为了在测量数据中证明GMN,通常通过忽略不需要的数据来后选择统计量。到目前为止,有效的后选择策略已被限制到本地后选择。一个一般的后选择,决定后,双方之间的通信可以模仿非局部性,即使完整的数据是本地的。在这里,我们建立的条件下,GMN是可证明的,即使观察后选择集体。有趣的是,某些需要多方沟通的选择后策略仍然提供了所有各方共享的GMN演示。这些结果是使用实验的因果结构和相对论施加的无信号条件得出的。最后,我们应用我们的结果表明,真正的三部非局域性可以创建独立的粒子源。

英文摘要:

The generation and verification of genuine multipartite nonlocality (GMN) is of central interest for both fundamental research and quantum technological applications, such as quantum privacy. To demonstrate GMN in measurement data, the statistics are commonly postselected by neglecting undesired data. Until now, valid postselection strategies have been restricted to local postselection. A general postselection that is decided after communication between parties can mimic nonlocality, even though the complete data are local. Here, we establish conditions under which GMN is demonstrable even if observations are postselected collectively. Intriguingly, certain postselection strategies that require communication among several parties still offer a demonstration of GMN shared between all parties. The results are derived using the causal structure of the experiment and the no-signalling condition imposed by relativity. Finally, we apply our results to show that genuine three-partite nonlocality can be created with independent particle sources.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑