Explain how measurement turns quantum state into classical data and why basis choice matters.
The move: ask what measurement commits the circuit to. A quantum circuit can hold phase relationships that have no direct classical equivalent. Measurement converts that state into a classical bit string, but it also removes the very relationships that many algorithms depend on. That is why "just measure it" is often the wrong instinct. The basis matters. Measuring after a Hadamard can reveal a pattern that measuring before the Hadamard hides. In practice, circuit diagrams put measurement gates at deliberate points because each readout says: from here on, this part of the system is classical information. When reviewing results, do…
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