Quantum Computing, Qiskit, General U3 Gate, Controlled U3 Gate, Tutorial.
(2) We know that the U3 gate is given by the matrix given in Eq. (1). Also, we can write the value of |𝜓⟩ in the form of a column vector: Eq. (3) Just to visualize what a U3 gate looks like, let’s build a demo circuit: Since this is a single qubit gate, the circuit has only one qubit whose initial