03.50.+b Bound entanglement

Bell inequalities with no quantum violation and unextendible product bases

Date: 
2011-08-12
Author(s): 

R. Augusiak, J. Stasinska, C. Hadley, J. K. Korbicz, M. Lewenstein, A. Acín

Reference: 

Phys. Rev. Lett. 107, 070401 (2011)

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.

Bell inequalities with no quantum violation and unextendible product bases

Date: 
2011-08-12
Author(s): 

R. Augusiak, J. Stasińska, C. Hadley, J. K. Korbicz, M. Lewenstein, A. Acín

Reference: 

Phys. Rev. Lett. 107, 070401 (2011)
doi: 10.1103/PhysRevLett.107.070401

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.

Noisy evolution of graph-state entanglement

Date: 
2010-09-21
Author(s): 

L. Aolita, D. Cavalcanti, R. Chaves, C. Dhara, L. Davidovich, and A. Acín

Reference: 

Phys. Rev. A 82, 032317 (2010)

The Uncertainty Principle in the Presence of Quantum Memory

Date: 
2010-07-25
Author(s): 

Mario Berta, Matthias Christandl, Roger Colbeck, Joseph M. Renes, Renato Renner

Reference: 

Nature Physics 6, 659-662 (2010)

The uncertainty principle bounds the uncertainties about the outcomes of two incompatible measurements on a particle. However, if the particle is prepared entangled with a quantum memory it is possible to predict the outcomes for both measurement choices precisely. In this work, the authors extend the uncertainty principle to this scenario, providing a lower bound on the uncertainties which depends on the amount of entanglement between the particle and the quantum memory.

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