Which Matrix
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- Each screen shows a gate or a product of gates and asks which matrix it equals. In a product the rightmost gate acts first.
- Pick the single gate it equals. Global phases count here, so iY and −iY are different answers.
- CNOT₀₁ has control q0 and target q1. CNOT₁₀ is the reverse.
- 8 questions and three lives. Right answers in a row score double, triple, then four times. Keys 1 to 4 answer, and Enter moves on.