**Input:** Two qubits in the $\ket{00}$ state (stored in an array of length 2).

**Goal:**  Change the state of the qubits to $\ket{+} \otimes \ket{+} = \frac{1}{2} \big(\ket{00} + \ket{01} + \ket{10} + \ket{11}\big)$.
