论文标题
网络中的量子非局部性可以用源之间任意较小的独立性来证明
Quantum nonlocality in networks can be demonstrated with an arbitrarily small level of independence between the sources
论文作者
论文摘要
即使在每个方只能执行单个测量值的情况下，也可以在网络中观察到量子非局部性，即不会收到任何输入。到目前为止，已经在网络中的所有来源彼此独立的假设中证明了这种效果。在这里，我们调查了这种独立性假设可以放松的程度。在正式化了这个问题之后，我们表明，在没有输入的三角网络中，即使仅假设来源之间的独立性很小，也可以观察到量子非局部性。这意味着量子预测不能由本地模型重现，除非三个来源可以完全相关。
Quantum nonlocality can be observed in networks even in the case where every party can only perform a single measurement, i.e. does not receive any input. So far, this effect has been demonstrated under the assumption that all sources in the network are fully independent from each other. Here we investigate to what extent this independence assumption can be relaxed. After formalizing the question, we show that, in the triangle network without inputs, quantum nonlocality can be observed, even when assuming only an arbitrarily small level of independence between the sources. This means that quantum predictions cannot be reproduced by a local model unless the three sources can be perfectly correlated.
