When you study entropy: "The time development operator in quantum theory is unitary, because the Hamiltonian is hermitian." Uh-huh.
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@michael_nielsen conceptually familiar with matrix yes
@RitaJKing The Hamiltonian is the thing that says how the wave function (probabilities) change over time.
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@michael_nielsen why do the probabilities change over time? And *how* can they change over time? -
@RitaJKing The unitarity means (roughly) that probabilities always add up to one.
End of conversation
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