论文标题
验证整体与可分离部分的真正多部分纠缠
Verifying genuine multipartite entanglement of the whole from its separable parts
论文作者
论文摘要
在实验上，我们证明了具有真正的多部分纠缠的三量量子状态的预测存在，该状态只能从其可分离的两分点降低密度矩阵中进行认证。量子位编码为一对相关光子的不同程度，并通过让光子通过线性光学电路传播来制备状态。通过在数字上发现完全分解的纠缠证人，仅在全球国家的减少方面进行非凡起作用，可以验证真正的多部分纠缠的存在。我们的结果证实了从缺乏特性的各个部分发现复合量子系统的新兴全局性质的可行性。
We prove experimentally the predicted existence of a three-qubit quantum state with genuine multipartite entanglement which can be certified solely from its separable two-qubit reduced density matrices. The qubits are encoded into different degrees of freedom of a pair of correlated photons and the state is prepared by letting the photons to propagate through a linear optical circuit. The presence of genuine multipartite entanglement is verified by finding numerically a fully decomposable entanglement witness acting nontrivially only on the reductions of the global state. Our result confirms viability of detection of emerging global properties of composite quantum systems from their parts which lack the properties.
