# Analytically parameterized solutions for robust quantum control using smooth pulses

## TL;DR

This paper develops an analytical framework for designing robust smooth quantum control pulses, reducing reliance on numerical searches and enabling efficient parameter determination for high-fidelity quantum operations.

## Contribution

It extends previous analytical methods to determine pulse parameters without numerical search and simplifies the problem to coupled differential equations.

## Key findings

- Analytical pulse parameters can be obtained without numerical optimization.
- The control problem reduces to coupled ordinary differential equations.
- Enhanced robustness and efficiency in quantum control pulse design.

## Abstract

Achieving high-fidelity control of quantum systems is essential for realization of a practical quantum computer. Composite pulse sequences which suppress different types of errors can be nested to suppress a wide variety of errors but the result is often not optimal, especially in the presence of constraints such as bandwidth limitations. Robust smooth pulse shaping provides flexibility, but obtaining such analytical pulse shapes is a non-trivial problem, and choosing the appropriate parameters typically requires a numerical search in a high-dimensional space. In this work, we extend a previous analytical treatment of robust smooth pulses to allow the determination of pulse parameters without numerical search. We also show that the problem can be reduced to a set of coupled ordinary differential equations which allows for a more streamlined numerical treatment.