Quantum correlations and secret bits

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  • 8 October 2003
Abstract
We analyze the process of establishing correlations between two honest parties, when part of the information is accessible to an adversary third party. Given a joint probability distribution, two different preparations are considered, depending on the involved resources: using entanglement or a classical private channel. We prove that the formation of a probability distribution requires entangled states, i.e. it is not compatible with any separable state, if and only if secret bits are consumed in an alternative fully classical preparation.

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