Function dynamical_correlator 

pub fn dynamical_correlator<H, A, B>(
    hamiltonian: &H,
    state: &[Complex64],
    left_probe: &A,
    right_probe: &B,
    options: EvolutionOptions,
) -> Result<Vec<Complex64>>
where
    H: LinearOperator + ?Sized,
    A: LinearOperator + ?Sized,
    B: LinearOperator + ?Sized,

Real-time two-point function <psi|A(t) B(0)|psi>.