A local hidden variable model exploiting the detection loophole to reproduce exactly the quantum correlation of the singlet state is presented. The model is shown to be compatible with both the CHSH and the CH Bell inequalities. Moreover, it bears the same rotational symmetry as spins. The reason why the model can reproduce the quantum correlation without violating the Bell theorem is that in t...

Supplementary EPAPS Document J. B. Brask,1 L. Jiang,2 A. V. Gorshkov,2 V. Vuletic,3 A. S. Sørensen,1 and M. D. Lukin2 1QUANTOP, The Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen Ø, Denmark 2Department of Physics, Harvard University, Cambridge, MA 02138, USA 3Harvard-MIT Center for Ultracold Atoms, Department of Physics, MIT, Cambridge, MA 02139, USA (Dated: September 29, 2009)...

High-fidelity polarization-entangled photons are a powerful resource for quantum communication, distributing entanglement and teleportation. The Bell-CHSH inequality $S\leq2$ is violated by bipartite only maximally entangled states can achieve $S=2\sqrt{2}$, the Tsirelson bound. Spontaneous parametric down-conversion sources produce with correlations close to Sagnac configurations offer intrins...

A local hidden variable model exploiting the detection loophole to reproduce exactly the quantum correlation of the singlet state is presented. The model is shown to be compatible with both the CHSH and the CH Bell inequalities. Moreover, it bears the same rotational symmetry as spins. The reason why the model can reproduce the quantum correlation without violating the Bell theorem is that in t...

In this contribution I will review the analysis of the Einstein-Podolsky-Rosen argument [19], Bell’s inequalities [5] and of associated experiments for spins in terms of positive operator valued measures (in short: povms). Specifically, I will explore the relation between the Clauser-Horne-Shimony-Holt (CHSH) [16] inequality and a fundamental classicality property of observables – their coexist...

In this work, there are two parties, Alice on Earth and Bob on the satellite, which initially share an entangled state, and some open problems, which emerge during quantum steering that Alice remotely steers Bob, are investigated. Our analytical results indicate that all entangled pure states and maximally entangled evolution states (EESs) are steerable, and not every entangled evolution state ...

Device-independent quantum key distribution (DIQKD) is one of the most challenging tasks in cryptography. The protocols and their security are based on existence Bell inequalities ability to violate them by measuring entangled states. We study entanglement needed for DIQKD two different ways. Our first contribution derivation upper bounds rates CHSH-based terms violation inequality; this sets a...