Tendick Lucas, Kampermann Hermann, Bruß Dagmar
Institute for Theoretical Physics III, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany.
Phys Rev Lett. 2020 Feb 7;124(5):050401. doi: 10.1103/PhysRevLett.124.050401.
We discuss the relation between entanglement and nonlocality in the hidden nonlocality scenario. Hidden nonlocality signifies nonlocality that can be activated by applying local filters to a particular state that admits a local hidden-variable model in the Bell scenario. We present a fully biseparable three-qubit bound entangled state with a local model for the most general (nonsequential) measurements. This proves for the first time that bound entangled states can admit a local model for general measurements. We furthermore show that the local model breaks down when suitable local filters are applied. Our results demonstrate the first example of activation of nonlocality in bound entanglement. Hence, we show that genuine hidden nonlocality does not imply entanglement distillability.
我们讨论了隐藏非局域性情形下纠缠与非局域性之间的关系。隐藏非局域性表示通过对在贝尔情形中允许局部隐变量模型的特定状态应用局部滤波器可以激活的非局域性。我们给出了一个完全可分的三量子比特束缚纠缠态，并针对最一般（非顺序）测量给出了一个局部模型。这首次证明了束缚纠缠态对于一般测量可以有一个局部模型。我们还表明，当应用合适的局部滤波器时，局部模型会失效。我们的结果展示了束缚纠缠中非局域性激活的首个例子。因此，我们表明真正的隐藏非局域性并不意味着纠缠可提纯性。
