Witnessing Bell violations through probabilistic negativity

Bell violations through independent bases games

In a recent paper, Junge and Palazuelos presented two two-player games exhibiting interesting properties. In their first game, entangled players can perform notably better than classical players. The quantitative gap between the two cases is remarkably large, especially as a function of the number of inputs to the players. In their second game, entangled players can perform notably better than ...

Observing Entanglement: Violations of Bell Inequalities

Strong violations of Bell-type inequalities for Werner-like states

We investigate the violation of Bell-type inequalities for two-qubit Werner-like states parametrized by the positive parameter 0 p 1. We use an unbalanced homodyne detection scheme to obtain the quantum mechanical probabilities. A violation of the Bell-Wigner and Janssens inequalities is obtained for a large range of the parameter p. The range given by these inequalities is greater than the one...

Entangled-state generation and Bell inequality violations in nanomechanical resonators

J. Robert Johansson,1 Neill Lambert,2 Imran Mahboob,3 Hiroshi Yamaguchi,3 and Franco Nori2,4 1iTHES Research Group, RIKEN, Saitama 351-0198, Japan 2CEMS, RIKEN, Saitama 351-0198, Japan 3NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi 243-0198, Japan 4Physics Department, University of Michigan, Ann Arbor, Michigan 48109, USA (Received 4 March 2014; revised man...

Unbounded violations of bipartite Bell Inequalities via Operator Space theory

In this work we show that bipartite quantum states with local Hilbert space dimension n can violate a Bell inequality by a factor of order Ω ( √ n log2 n ) when observables with n possible outcomes are used. A central tool in the analysis is a close relation between this problem and operator space theory and, in particular, the very recent noncommutative Lp embedding theory. As a consequence of...