Returns intervals of CZPowGate exponents valid for FSim decomposition.
) -> Sequence[Tuple[float, float]]
Ideal intervals associated with the constraints are closed, but due to
numerical error the caller should not assume the endpoints themselves
are valid for the decomposition. See
for details on how FSimGate parameters constrain the phase angle of
FSimGate into which CZPowGate would be decomposed.
Sequence of 2-tuples each consisting of the minimum and maximum
value of the exponent for which CZPowGate can be decomposed into
two FSimGates. The intervals are cropped to [0, 2]. The function
returns zero, one or two intervals.