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Specker’s parable of the overprotective seer: A road to contextuality, nonlocality and complementarity
A strong no-go theorem on the Wigner’s friend paradox
Does quantum theory apply at all scales, including that of observers? New light on this fundamental question has recently been shed through a resurgence of interest in the long-standing Wigner’s…
Quantum non-locality based on finite-speed causal influences leads to superluminal signalling
- J. Bancal, Stefano Pironio, A. Acín, Yeong-Cherng Liang, V. Scarani, N. Gisin
- Physics, Computer Science
- 17 October 2011
It is shown that non-local quantum correlations between distant particles cannot be explained by signals propagating slower than the speed of light either, because that would permit faster-than-light communication.
The Quantum Moment Problem and Bounds on Entangled Multi-prover Games
- A. Doherty, Yeong-Cherng Liang, B. Toner, S. Wehner
- Mathematics23rd Annual IEEE Conference on Computational…
- 31 March 2008
It is proved that a hierarchy of semidefinite programs similar to the one given by Navascues, Pironioand Acin converges to the entangled value of the game and it would follow that the languages recognized by a multi-prover interactive proof system where the provers share entanglement are recursive.
All bipartite entangled States display some hidden nonlocality.
It is demonstrated that a violation of the Clauser-Horne-Shimony-Holt (CHSH) inequality can be demonstrated in a certain kind of Bell experiment for all entangled states, and it is proved that for each entangled state sigma, there exists another state rho not violating the CHSH inequality.
A resource theory of quantum memories and their faithful verification with minimal assumptions
A complete set of game-theoretic conditions equivalent to the existence of a transformation from one quantum channel into another one, by means of classically correlated pre/post processing maps only, are provided, mirroring the resource theory of entanglement in quantum states.
Arbitrarily small amount of measurement independence is sufficient to manifest quantum nonlocality.
- Gilles Pütz, D. Rosset, T. Barnea, Yeong-Cherng Liang, N. Gisin
- MathematicsPhysical review letters
- 21 July 2014
It is proved that even in the simplest Bell test-one involving 2 parties each performing 2 binary-outcome measurements-an arbitrarily small amount of measurement independence is sufficient to manifest quantum nonlocality.
Device-independent witnesses of genuine multipartite entanglement.
- J. Bancal, N. Gisin, Yeong-Cherng Liang, Stefano Pironio
- PhysicsPhysical review letters
- 1 February 2011
An n-partite inequality is presented that is satisfied by all correlations produced by measurements on biseparable quantum states, but which can be violated by n- partite entangled states, such as Greenberger-Horne-Zeilinger states.
Measurement-device-independent entanglement witnesses for all entangled quantum states.
This work introduces the concept of measurement-device-independent entanglement witnesses (MDI-EWs), which allow one to demonstrateEntanglement of all entangled quantum states with untrusted measurement apparatuses, and shows how to systematically obtain such MDI-ews from standard entangler witnesses.
Device-independent entanglement quantification and related applications.
- T. Moroder, J. Bancal, Yeong-Cherng Liang, Martin Hofmann, O. Gühne
- Computer SciencePhysical review letters
- 6 February 2013
It is shown that the method presented provides a rigorous way to construct dimension witnesses, gives new insights into the question whether bound entangled states can violate a Bell inequality, and can be used to construct device-independent entanglement witnesses involving an arbitrary number of parties.