Spooky Duel

Win a game no classical team can win.

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About 5 min
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Classical teams

Every team that agrees on its answers in advance is one of these sixteen. Each cell is its win rate over all four possible secret-bit pairs.

75752525752575252575257525257575

The best any of them can do is 75%. That is the classical wall.

Entangled team

Alice and Bob share one entangled pair. Each picks a measurement direction depending on their secret bit.

Alice, secret bit 00°Alice, secret bit 10°Bob, secret bit 00°Bob, secret bit 10°

Set the four angles, then play. With every angle at 0° the team behaves classically.

Setting up the table…

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