Quantum Computing, Qiskit, General U3 Gate, Controlled U3 Gate, Tutorial.
General U gates are generic single-qubit rotation gates with 3 Euler angles (i.e. θ, ϕ, λ). It is called ‘general’ because any single qubit quantum gate can be represented by a U(θ, ϕ, λ) gate. General U3 gates are given by: Eq. (1) Qiskit provides U2 and U1-gates, which are specific cases of the