# All-optical logic gates in Stub photonic lattices

## TL;DR

This paper demonstrates the experimental realization of all-optical logic gates using Stub photonic lattices, leveraging localized flat band states to perform logical operations with potential for scalable optical computing.

## Contribution

It introduces a novel setup utilizing flat band localized states in photonic lattices to implement all-optical logic gates like OR, AND, and XOR.

## Key findings

- Localized flat band states do not diffract and remain trapped.
- Superposition of states enables logical operations.
- Flat band systems can perform optical logic at various power levels.

## Abstract

We experimentally study a Stub photonic lattice and excite their localized linear states originated from an isolated Flat Band at the center of the linear spectrum. By exciting these modes in different regions of the lattice, we observe that they do not diffract across the system and remain well trapped after propagating along the crystal. By using their wave nature, we are able to combine -- in phase and out of phase -- two neighbor states into a coherent superposition. These observations allow us to propose a novel setup for performing three different all-optical logical operations such as OR, AND, and XOR, positioning Flat Band systems as key setups to perform concrete applications at any level of power.