T2 = 0.5200016498394/J   (pi/6 = 0.5235987755983)
identity s^2 + 32 s - 4 = -3.38e-14
leakage 3.85e-16, off-diagonal 1.07e-16
entangling phase -3.141592653590  (CZ: pi = 3.141592653590)