Modified Newton-Raphson GRAPE methods for optimal control of spin systems
Modified Newton-Raphson GRAPE methods for optimal control of spin systems
Quadratic convergence throughout the active space is achieved for the gradient ascent pulse engineering (GRAPE) family of quantum optimal control algorithms. We demonstrate in this communication that the Hessian of the GRAPE fidelity functional is unusually cheap, having the same asymptotic complexity scaling as the functional itself. This leads to …