Shortcut to Adiabatic Passage in a Waveguide Coupler with Allen-Eberly scheme

TL;DR

This paper introduces a shortcut to adiabatic passage in a waveguide coupler using the Allen-Eberly scheme and transitionless quantum driving, significantly reducing device length while maintaining high efficiency and robustness.

Contribution

It applies the shortcut to adiabatic passage method to a waveguide coupler, enhancing efficiency and robustness over traditional adiabatic methods.

Findings

Device length is significantly reduced using STA.

Power transfer efficiency remains at 100%.

The shortcut approach outperforms traditional adiabatic methods in robustness and fidelity.

Abstract

We propose a directional coupler exploiting the framework of adiabatic passage for two level atomic systems with configuration dependent Allen-Eberly scheme. Recently developed shortcut to adiabatic passage method (STA), which uses transitionless quantum driving algorithm, is applied to the coupler. The study shows that it is possible to reduce the device length significantly using STA, keeping the efficiency of power transfer100%.Shortcut approach shows much superiority in terms of robustness and fidelity in power switching compared to the adiabatic one.