According to [Goodwin and Kuprov, "Modified Newton-Raphson GRAPE methods for optimal control of spin systems", J. Chem. Phys. 144, 204107 (2016)](https://aip.scitation.org/doi/pdf/10.1063/1.4949534), the full Hessian can be calculated without too much effort
According to Goodwin and Kuprov, "Modified Newton-Raphson GRAPE methods for optimal control of spin systems", J. Chem. Phys. 144, 204107 (2016), the full Hessian can be calculated without too much effort