No-signaling, dynamical independence, and the local observability principle

Abstract

Within a general operational framework I show that a-causality at a distance of "local actions" (the so-called "no-signaling") is a direct consequence of commutativity of local transformations, i.e. of dynamical independence. On the other hand, the tensor product of Quantum Mechanics is not just a consequence of such dynamical independence, but needs in addition the Local Observability Principle.

Presented at the conference "Theory and Technology in Quantum Information, Communication, Computation and Cryptography", Trieste SISSA, June 2006. Submitted to J. Phys. A. Math. Gen

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• No-signaling, dynamical independence, and the local observability principle