Fix Grover's algorithm answer - #5502
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Fix incorrect answer in Grover's algorithm "check your understanding"
Fixes #5500
The check-your-understanding question asks readers to derive, from the Hadamard gate definition, that a second application of$H^2=I$ ). The posted answer instead discussed applying $|+\rangle$ /$|-\rangle$ and computing an expectation value, content from a different question (the same paragraph appears correctly in
Hundoes a superposition (i.e.Xtosuperposition-with-qiskit.ipynb), not this one.Replaced the answer with a derivation showing$H(H|0\rangle)=|0\rangle$ and $H(H|1\rangle)=|1\rangle$ from the stated gate definitions, matching what the question actually asks.