Quantum games — play along

1 · Quantum Coin Game fun-with-quantum.org/play/quantum-coin-game

A coin is hidden in a box and starts on heads. The computer moves, then you, then the computer again. Each move is flip it or leave it, and nobody sees the other's moves. Tails: you win. Heads: the computer wins.

Play 5 rounds against the quantum computer (chapter 2). Rounds you won: ______ of 5.

What move does the quantum computer have that you don't? (chapter 3)

2 · GHZ Game fun-with-quantum.org/play/ghz-game teams of 3

Each player is asked for a color (red or blue) or a shape (star or rectangle) — either all three for the color, or one for the color and two for the shape. No talking once the questions are asked. The team wins if an even number say red (all asked for the color), or an odd number say red or star (one color, two shapes).

Best classical team: wins ______ of the 4 questions.   Quantum team: wins ______ of the 4.

3 · The CHSH Game fun-with-quantum.org/play/chsh-game teams of 2

Alice gets a random bit x, Bob a random bit y, in separate rooms. Each answers with a bit. They win with the same answer — unless both got a 1; then they need different answers.

Best classical team: wins ______ % of the rounds.   Quantum team: ______ %.

Think about it

The quantum teams never talk after the questions. How can they still beat every classical team?