Results 51 to 60 of about 4,469 (136)

Device-independent lower bounds on the conditional von Neumann entropy [PDF]

Quantum
The rates of several device-independent (DI) protocols, including quantum key-distribution (QKD) and randomness expansion (RE), can be computed via an optimization of the conditional von Neumann entropy over a particular class of quantum states.
Peter Brown, Hamza Fawzi, Omar Fawzi
doaj   +1 more source

Bell inequalities for three systems and arbitrarily many measurement outcomes

, 2012
We present a family of Bell inequalities for three parties and arbitrarily many outcomes, which can be seen as a natural generalization of the Mermin Bell inequality.
A. C. Doherty, A. Salles, Basile Grandjean, D. M. Greenberger, D. Mayers, J. Löfberg, J. S. Bell, J. S. Bell, Jean-Daniel Bancal, L. Masanes, Nicolas Brunner, Nicolas Gisin, Yeong-Cherng Liang   +12 more
core   +3 more sources

Maximal randomness from partially-entangled states

, 2020
We investigate how much randomness can be extracted from a generic partially-entangled pure state of two qubits in a device-independent setting, where a Bell test is used to certify the correct functioning of the apparatus.
Acín, Antonio, Augusiak, Remigiusz, Bourdoncle, Boris, Bowles, Joseph, Kaniewski, Jędrzej, Salavrakos, Alexia, Woodhead, Erik   +6 more
core   +1 more source

Popescu-Rohrlich correlations as a unit of nonlocality [PDF]

, 2005
A set of nonlocal correlations that have come to be known as a PR box suggest themselves as a natural unit of nonlocality, much as a singlet is a natural unit of entanglement. We present two results relevant to this idea.
Barrett, Jonathan, Pironio, Stefano
core   +2 more sources

Measurement-device-independent entanglement and randomness estimation in quantum networks [PDF]

, 2017
Detection of entanglement in quantum networks consisting of many parties is one of the important steps towards building quantum communication and computation networks.
Cavalcanti, Daniel, Skrzypczyk, Paul, Šupić, Ivan   +2 more
core   +2 more sources

Bell nonlocality

, 2014
Bell's 1964 theorem, which states that the predictions of quantum theory cannot be accounted for by any local theory, represents one of the most profound developments in the foundations of physics.
Brunner, Nicolas, Cavalcanti, Daniel, Pironio, Stefano, Scarani, Valerio, Wehner, Stephanie   +4 more
core   +2 more sources

Lifting Bell inequalities [PDF]

, 2005
A Bell inequality defined for a specific experimental configuration can always be extended to a situation involving more observers, measurement settings, or measurement outcomes. In this article, such "liftings" of Bell inequalities are studied.
Acín A., Bell J. S., Cushing J. T., Masanes L., Pitowsky I., Schrijver A., Stefano Pironio, Tittel W.   +7 more
core   +2 more sources

Mutually unbiased bases: polynomial optimization and symmetry [PDF]

Quantum
A set of $k$ orthonormal bases of $\mathbb C^d$ is called mutually unbiased if $|\langle e,f\rangle |^2 = 1/d$ whenever $e$ and $f$ are basis vectors in distinct bases. A natural question is for which pairs $(d,k)$ there exist $k$ mutually unbiased bases
Sander Gribling, Sven Polak
doaj   +1 more source

Random 'choices' and the locality loophole

, 2014
It has been claimed that to close the locality loophole in a Bell experiment, random numbers of quantum origin should be used for selecting the measurement settings.
Pironio, Stefano
core  

Bell tests for continuous variable systems using hybrid measurements and heralded amplifiers

, 2012
We present Bell tests for optical continuous variable systems, combining both hybrid measurements (i.e. measuring both particle and wave aspects of light) and heralded amplifiers.
Brask, Jonatan Bohr, Brunner, Nicolas, Cavalcanti, Daniel, Leverrier, Anthony   +3 more
core   +1 more source