Optimal robust stimulated Raman exact passage by inverse optimization

TL;DR

This paper develops an inverse optimization method to design robust stimulated Raman passage protocols that minimize loss and optimize control fields, improving efficiency and robustness in quantum state transfer.

Contribution

It introduces an inverse geometric optimization approach to generate optimal, robust STIREP control fields considering upper state loss, with novel pulse sequence structures.

Findings

Loss reduced to about a third of non-robust methods

Optimal control fields form simple, intuitive, and counter-intuitive pulse pairs

Alternative solutions achieve lower losses and larger pulse areas

Abstract

We apply the inverse geometric optimization technique to generate an optimal and robust stimulated Raman exact passage (STIREP) considering the loss of the upper state as a characterization parameter. Control fields temporal shapes that are optimal with respect to pulse area, energy, and duration, are found to form a simple sequence with a combination of intuitively (near the beginning and the end) and counter-intuitively ordered pulse pairs. The resulting dynamics produces a loss which is about a third of that of the non-robust optimal STIREP. Alternative optimal solutions featuring lower losses, larger pulse areas, and fully counter-intuitive pulse sequences are derived.