Smooth optimal control with Floquet theory

TL;DR

This paper introduces a method for designing smooth, periodic control pulses for quantum systems using Floquet theory, enabling high-precision manipulation of spin dynamics and entanglement.

Contribution

It presents a novel Floquet-based variational approach for optimizing temporally shaped control pulses in quantum systems.

Findings

Achieved high-accuracy quantum gate operations.

Controlled entanglement dynamics effectively.

Demonstrated the method on interacting spin systems.

Abstract

This paper describes an approach to construct temporally shaped control pulses that drive a quantum system towards desired properties. A parametrization in terms of periodic functions with pre-defined frequencies permits to realize a smooth, typically simple shape of the pulses; their optimization can be performed based on a variational analysis with Floquet theory. As we show with selected specific examples, this approach permits to control the dynamics of interacting spins, such that gate operations and entanglement dynamics can be implemented with very high accuracy.