Lee Ciarán M, Hoban Matty J
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
Department of Computer Science, University of Oxford, Wolfson Building, Parks Road, OX1 3QD, United Kingdom.
Phys Rev Lett. 2018 Jan 12;120(2):020504. doi: 10.1103/PhysRevLett.120.020504.
The violation of certain Bell inequalities allows for device-independent information processing secure against nonsignaling eavesdroppers. However, this only holds for the Bell network, in which two or more agents perform local measurements on a single shared source of entanglement. To overcome the practical constraints that entangled systems can only be transmitted over relatively short distances, large-scale multisource networks have been employed. Do there exist analogs of Bell inequalities for such networks, whose violation is a resource for device independence? In this Letter, the violation of recently derived polynomial Bell inequalities will be shown to allow for device independence on multisource networks, secure against nonsignaling eavesdroppers.
违反某些贝尔不等式可实现针对无信号窃听者的与设备无关的信息处理安全。然而，这仅适用于贝尔网络，即两个或更多代理对单个共享纠缠源进行局部测量的网络。为克服纠缠系统只能在相对较短距离内传输这一实际限制，人们采用了大规模多源网络。对于此类网络，是否存在贝尔不等式的类似物，其违反情况是实现设备无关性的一种资源？在本信函中，将表明违反最近推导出的多项式贝尔不等式可实现多源网络上的设备无关性，防范无信号窃听者。
