Optimal Control of Quantum System for Fast Pulses at High Accuracy with GOAT (Gradient Optimization for Analytic conTrols)
Dr. Shai Machnes (Theoretische Physik, Universität des Saarlandes, Saarbrücken)

We briefly review the field of quantum optimal control, as it has become a necessary tool for many of studies in the quantum realm. As recent experimental advances demonstrated that quantum systems can be controlled with an impressive accuracy, one requires optimal control algorithms of comparable accuracy. However, most of the approaches cannot efficiently achieve an equivalent accuracy, due to their reliance on piecewise-constant approximation or lack of goal function gradient information. To tackle this issue, a novel quantum optimal control algorithm has been developed: GOAT (Gradient Optimization for Analytic conTrols). It allows for accurate modelling experiments, including any control ansatz, waveform generators and in-situ bandpass filtering, as well as non-coherent phenomena. In addition, GOAT allows for gradient-based, multi-goal optimization, including optimizing for quickest possible control sequences, revealing the quantum speed limit.