Rotation gates implementation using Qiskit. The example applies $R_x(\pi/2)$ to $\lvert 0\rangle$, producing $\frac{1}{\sqrt{2}}(\lvert 0\rangle - i\lvert 1\rangle)$.
from qiskit import QuantumCircuit from qiskit.quantum_info import Statevector import numpy as np qc = QuantumCircuit(1) qc.rx(np.pi / 2, 0) # R_x(pi/2) on |0> print(Statevector(qc)) # Statevector([0.70710678+0.j, 0. -0.70710678j], dims=(2,))