Strong nonlocality: a trade-off between states and measurements
Strong nonlocality: a trade-off between states and measurements
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强非定域性：状态和测量之间的权衡
DOI：
10.1088/1367-2630/12/3/033034
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发表时间：
2009
影响因子：
3.3
通讯作者：
J. Barrett
中科院分区：
文献类型：
--
作者：
A. J. Short;J. Barrett
对纠缠量子态的测量可以产生非局域相关的结果。但是根据Tsirelson定理，量子非定域性有一个数量限制。这是有趣的探索会发生什么，如果Tsirelson的约束被违反。为此，我们考虑一个模型，允许任意的非局部相关性，俗称为“盒子世界”。我们表明，虽然盒子世界允许更多的高度纠缠态比量子理论，在盒子世界的测量是相当有限的。因此，没有纠缠交换，隐形传态或密集编码。
Measurements on entangled quantum states can produce outcomes that are nonlocally correlated. But according to Tsirelson's theorem, there is a quantitative limit on quantum nonlocality. It is interesting to explore what would happen if Tsirelson's bound were violated. To this end, we consider a model that allows arbitrary nonlocal correlations, colloquially referred to as ‘box world’. We show that while box world allows more highly entangled states than quantum theory, measurements in box world are rather limited. As a consequence there is no entanglement swapping, teleportation or dense coding.