Quantum Computing, Qiskit, General U3 Gate, Controlled U3 Gate, Tutorial.
Case 1: 𝜙=3𝜋/2 and 𝜆=0 Case 2: 𝜙=0 and 𝜆=3𝜋/2 Case 3: 𝜙=𝜋 and 𝜆=𝜋/2 Case 4: 𝜙=𝜋/2 and 𝜆=𝜋 All these cases give the correct answer and can be tried as an exercise. We will see the circuit for Case 1 here: Plotting the statevector on the bloch sphere: The statevector values give us the desired state: