期刊
PHYSICAL REVIEW LETTERS
卷 107, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.070401
关键词
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资金
- EU
- ERC
- Spanish MINCIN [FIS2010-14830, FIS2008-00784, FIS2008-01236, FPU AP2008-03043]
- QOIT
- Generalitat de Catalunya
- Caixa Manresa
- ICREA Funding Source: Custom
The strength of classical correlations is subject to certain constraints, commonly known as Bell inequalities. Violation of these inequalities is the manifestation of nonlocality-displayed, in particular, by quantum mechanics, meaning that quantum mechanics can outperform classical physics at tasks associated with such Bell inequalities. Interestingly, however, there exist situations in which this is not the case. We associate an intriguing class of bound entangled states, constructed from unextendable product bases with a wide family of tasks, for which (i) quantum correlations do not outperform the classical ones but (ii) there exist supraquantum nonsignaling correlations that do provide an advantage.
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