Achieving robust and high-fidelity quantum control via spectral phase optimization
This work addresses the need for robust quantum control in quantum information sciences, but the results are based on numerical simulations and the method is an incremental extension of frequency-domain optimal control theory.
The authors demonstrate a robust optimization method for quantum control by optimizing the spectral phase of ultrafast laser pulses, achieving high-fidelity control with robustness against field fluctuations in two- and three-level systems.
Achieving high-fidelity control of quantum systems is of fundamental importance in physics, chemistry and quantum information sciences. However, the successful implementation of a high-fidelity quantum control scheme also requires robustness against control field fluctuations. Here, we demonstrate a robust optimization method for control of quantum systems by optimizing the spectral phase of an ultrafast laser pulse, which is accomplished in the framework of frequency domain quantum optimal control theory. By incorporating a filtering function of frequency into the optimization algorithm, our numerical simulations in an abstract two-level quantum system as well as in a three-level atomic rubidium show that the optimization procedure can be enforced to search optimal solutions while achieving remarkable robustness against the control field fluctuations, providing an efficient approach to optimize the spectral phase of the ultrafast laser pulse to achieve a desired final quantum state of the system.