Counter-diabatic driving in a bent mode-evolution coupler

Area of Science:

• Photonics
• Quantum Control
• Waveguide Optics

Background:

• Adiabatic photonic devices are crucial for light manipulation.
• Achieving adiabaticity often requires long device lengths.
• Shortcuts to adiabaticity (STA) offer a way to speed up the process.

Purpose of the Study:

• To implement counter-diabatic (CD) driving in mode-evolution couplers using axis bending.
• To develop a compact and robust method for photonic device design.
• To validate the theoretical framework with numerical simulations.

Main Methods:

• Derivation of an analytical framework using coupled-mode theory.
• Introduction of geometric deformation (axis bending) to realize the CD protocol.
• Verification using Beam Propagation Method (BPM) simulations.

Main Results:

• Demonstrated complete light transfer in a 500 μm bent coupler.
• Observed minimal nonadiabatic transitions, validating the CD driving.
• Established deterministic design rules for bent waveguide systems.

Conclusions:

• Axis bending provides a feasible method for implementing CD driving in photonic couplers.
• The approach enables compact, robust, and efficient photonic devices.
• This work paves the way for robust shortcuts to adiabaticity photonic components.