Fast-forward scaling of atom-molecule conversion in Bose-Einstein condensates

TL;DR

This paper introduces a fast-forward scaling method for stimulated Raman adiabatic processes in nonlinear quantum systems, enabling efficient and robust atom-molecule conversion in Bose-Einstein condensates using controllable external fields.

Contribution

It develops a novel fast-forward scaling approach for nonlinear stimulated Raman processes, improving conversion speed and robustness over traditional adiabatic methods.

Findings

Enhanced fidelity and robustness in atom-molecule conversion.

Successful extension to fractional stimulated Raman processes.

Outperforms conventional adiabatic passages in nonlinear regimes.

Abstract

Robust stimulated Raman exact passages are requisite for controlling nonlinear quantum systems, with the wide applications ranging from ultracold molecules, non-linear optics to superchemistry. Inspired by shortcuts to adiabaticity, we propose the fast-forward scaling of stimulated Raman adiabatic processes with the nonlinearity involved, describing the transfer from an atomic Bose-Einstein condensate to a molecular one by controllable external fields. The fidelity and robustness of atom-molecule conversion are shown to surpass those of conventional adiabatic passages, assisted by fast-forward driving field. Finally, our results are extended to the fractional stimulated Raman adiabatic processes for the coherent superposition of atomic and molecular states.