Ramij Rahaman, Marcin Wieśniak, Marek Żukowski
We present a test for genuine multipartite entanglement by introducing a new variant of the Hardy's paradox for $n$ qu$D$its case. The test shows a contradiction between the Hardy-type correlations and local realism without resorting to statistical inequalities. Moreover, in some cases, it can distinguish a unique state satisfying all Hardy conditions. The argument find its application in a quantum-secured protocol for unanimous voting. The security of it is not only due quantum correlations between distributed particles, but also to a filtering of transferred classical data on the results obtained in the quantum part of the protocol. The protocol allows to keep individual opinions in secrecy.
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http://arxiv.org/abs/1303.0128
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