CROTXPi2Gate

class CROTXPi2Gate

Represent the fixed, parameterless controlled X rotation at \(\theta = \pi/2\).

\[CROTX_{\pi/2} = RX(\pi/2) \otimes |0\rangle\langle0| + RX(-\pi/2) \otimes |1\rangle\langle1|\]

The gate’s first qubit is the control. The formula is in Qiskit’s order, with the control as the right factor.

This is the native entangler of FixedCROTGateSet. It equals CROTXGate at \(\theta = \pi/2\), as a separate gate type without parameters.