Question: Problem 6 . Consider the four - qubit circuit at right, where U is the transformation on two qubits that maps | y to |

Problem 6. Consider the four-qubit circuit at right,
where U is the transformation on two qubits that maps
|y to |3y mod 4. Numbers n in (0,1,2,3) are repre-
sented in a two-qubit space using the standard map
0->|00,1->|01,2->|10,3->|11

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