Which State
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- Each screen shows one state, written as a ket or a density matrix.
- Pure product means a pure state that factors into one ket per qubit. Pure entangled means a pure state that will not factor.
- Mixed means a valid ρ with Tr ρ² below 1, whether or not it is entangled. Not a state means the norm or the eigenvalues are wrong.
- 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.