def __init__(self, theta, label=None, ctrl_state=None):
    'Create new CRX gate.'
    super().__init__('crx', 2, [theta], num_ctrl_qubits=1, label=label, ctrl_state=ctrl_state)
    self.base_gate = RXGate(theta)
Create new CRX gate.
def __init__(self, theta, label=None, ctrl_state=None):
    
    super().__init__('crx', 2, [theta], num_ctrl_qubits=1, label=label, ctrl_state=ctrl_state)
    self.base_gate = RXGate(theta)