Bell's theorem is a fundamental result in quantum mechanics: it discriminates between quantum mechanics and all theories where probabilities in measurement results arise from the ignorance of pre-existing local properties. We give an extremely simple proof of Bell's inequality; a single figure suffices. This simplicity may be useful in the unending debate over what exactly the Bell inequality m...

We study optimal teleportation based on the Bell measurements. An explicit expression for the quantum channel associated with the optimal teleportation with an arbitrary mixed state resource is presented. The optimal transmission fidelity of the corresponding quantum channel is calculated and shown to be related to the fully entangled fraction of the quantum resource, rather than the singlet fr...

In Bohmian mechanics, particles follow continuous trajectories, so two-time position correlations have been well defined. However, Bohmian mechanics predicts the violation of Bell inequalities. Motivated by this fact, we investigate position measurements in Bohmian mechanics by coupling the particles to macroscopic pointers. This explains the violation of Bell inequalities despite two-time posi...

It was shown in [1], cited in the sequel as DRHM, that upon a correct use of the respective statistical data, the celebrated Bell inequalities cannot be violated by quantum systems. This paper presents in more detail the surprisingly elementary, even if rather subtle related basic argument in DRHM, and does so together with a few comments which, hopefully, may further facilitate its wider under...

Classical Pitowsky correlation polytopes are reviewed with particular emphasis on the Minkowski-Weyl representation theorem. The inequalities representing the faces of polytopes are Boole’s “conditions of possible experience.” Many of these inequalities have been discussed in the context of Bell’s inequalities. We introduce CddIF, a Mathematica package created as an interface between Mathematic...

Bell’s theorem is a fundamental result in quantum mechanics: it discriminates between quantum mechanics and all theories where probabilities in measurement results arise from the ignorance of pre-existing local properties. We give an extremely simple proof of Bell’s inequality: a single figure suffices. This simplicity may be useful in the unending debate of what exactly the Bell inequality mea...

Observation shows that, to a very close approximation, real polarisers and photomultipliers reproduce Malus' Law even at the \single photon" level, giving a sinusoidal variation of \photon" count with polarisation angle. At rst sight, this appears to rule out various realist models of polarisers and detectors, and casts doubt on their ability to explain \paired-photon" EPR experiments. The obse...

The cut polytope and its relatives are good models of the correlations that can be obtained between events that can be well described by classical physics. Bell’s Theorem and subsequent experiments demonstrate that correlations obtainable between events at the quantum level cannot be modelled in this way. This raises the question of whether a “good” mathematical characterization of quantum corr...

We discuss a class of proofs of Bell-type inequalities that are based on tables of potential outcomes. These proofs state in essence: if one can only imagine (or write down in a table) the potential outcome of a hidden parameter model for EPR experiments then a contradiction to experiment and quantum mechanics follows. We show that these proofs do not contain hidden variables that relate to tim...