Earlier this summer, Institut quantique launched its third Quantum enigma – The Four-squared chessboard. Alice and Bob are challenged by Aïka, who’s hidden a key under one of the four chessboard squares. A coin is then randomly placed on each of the four squares. How will Alice communicate to Bob the exact position of the key by flipping only one coin? This enigma introduces a new quantum computing concept: the control by the 0-state.
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