Extending loophole-free nonlocal correlations to arbitrarily large distances

IF 6.6 1区 物理与天体物理 Q1 PHYSICS, APPLIED
Anubhav Chaturvedi, Giuseppe Viola, Marcin Pawłowski
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引用次数: 0

Abstract

Quantum theory allows spatially separated observers to share nonlocal correlations, which enable them to accomplish classically inconceivable information processing and cryptographic feats. However, the distances over which nonlocal correlations can be realized remain severely limited due to their high fragility to noise and high threshold detection efficiencies. To enable loophole-free nonlocality across large distances, we introduce Bell experiments wherein the spatially separated parties randomly choose the location of their measurement devices. We demonstrate that when devices close to the source are perfect and witness extremal nonlocal correlations, such correlations can be extended to devices placed arbitrarily far from the source. To accommodate imperfections close to the source, we demonstrate an analytic trade-off: the higher the loophole-free nonlocality close to the source, the lower the threshold requirements away from the source. We utilize this trade-off and formulate numerical methods to estimate the critical requirements of individual measurement devices in such experiments.

Abstract Image

将无漏洞非局部相关性扩展到任意大距离
量子理论允许空间上分离的观察者共享非局部相关性,这使他们能够完成经典上难以想象的信息处理和密码学壮举。然而,由于非局部相关性对噪声的高脆弱性和高阈值检测效率,实现非局部相关性的距离仍然受到严重限制。为了在大距离上实现无漏洞的非局域性,我们引入了贝尔实验,让空间上分离的双方随机选择测量设备的位置。我们证明,当靠近信号源的设备是完美的,并见证了极端非局部相关性时,这种相关性可以扩展到任意远离信号源的设备上。为了适应靠近源的不完美性,我们证明了一种分析权衡:靠近源的无漏洞非局部性越高,远离源的阈值要求就越低。我们利用这种权衡并制定了数值方法来估算此类实验中单个测量设备的临界要求。
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来源期刊
npj Quantum Information
npj Quantum Information Computer Science-Computer Science (miscellaneous)
CiteScore
13.70
自引率
3.90%
发文量
130
审稿时长
29 weeks
期刊介绍: The scope of npj Quantum Information spans across all relevant disciplines, fields, approaches and levels and so considers outstanding work ranging from fundamental research to applications and technologies.
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