No-local-broadcasting theorem for multipartite quantum correlations
No-local-broadcasting theorem for multipartite quantum correlations
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DOI：
10.1103/physrevlett.100.090502
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发表时间：
2008-03-07
影响因子：
8.6
通讯作者：
Horodecki, Ryszard
中科院分区：
文献类型：
--
作者：
Piani, Marco;Horodecki, Pawel;Horodecki, Ryszard
我们证明了存在于多体量子态中的关联具有可操作的量子特征，即使该状态是非纠缠的，只要它不简单地编码多体经典概率分布。所述量子性通过本地广播的新任务来揭示，即，局部共享预先建立的相关性，这是可行的，当且仅当相关性是严格经典的。我们的操作方法导致相关性的量子性的措施的自然定义。它还再现了标准的无广播定理作为一个特殊情况。
We prove that the correlations present in a multipartite quantum state have an operational quantum character even if the state is unentangled, as long as it does not simply encode a multipartite classical probability distribution. Said quantumness is revealed by the new task of local broadcasting, i.e., of locally sharing preestablished correlations, which is feasible if and only if correlations are stricly classical. Our operational approach leads to natural definitions of measures for quantumness of correlations. It also reproduces the standard no-broadcasting theorem as a special case.