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Implementing 2-qubit pseudo-telepathy games on noisy intermediate scale quantum computers
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It is known that Mermin-Peres like proofs of quantum contextuality can furnish non-local games with a guaranteed quantum strategy, when classically no such guarantee can exist. This phenomenon, also called quantum pseudo-telepathy, has been studied in the case of the so-called Mermin Magic square game. In this paper we review in detail two different ways of implementing on a quantum computer such a game and propose a new Doily game based on the geometry of 2-qubit Pauli group. We show that the quantumness of these games are almost revealed when we play them on the IBM Quantum Experience, however the inherent noise in the available quantum machines prevents a full demonstration of the non-classical aspects.
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Four-Qubit CHSH Games
The authors identify four-player CHSH games in which a GHZ state yields a 22.5% quantum advantage over classical play, and another game where a W state is the better resource.
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