# Stationary quantum vortex street in a driven-dissipative quantum fluid of light

## TL;DR

This paper explores the formation of a novel class of density-phase defects, including vortex streets, in a driven-dissipative 2D quantum fluid of light, revealing stable configurations and potential for complex potential implementations.

## Contribution

It introduces the concept of stationary quantum vortex streets in a driven-dissipative quantum fluid of light, demonstrating their formation, stability, and potential for complex potential engineering.

## Key findings

- Vortex streets form in 2D quantum fluid of light under bistability.
- Dark soliton molecules evolve into vortex street configurations.
- Flexible potential design enables maze-like vortex connections.

## Abstract

We investigate the formation of a new class of density-phase defects in a resonantly driven 2D quantum fluid of light. The system bistability allows the formation of low density regions containing density-phase singularities confined between high density regions. We show that in 1D channels, an odd (1-3) or even (2-4) number of dark solitons form parallel to the channel axis in order to accommodate the phase constraint induced by the pumps in the barriers. These soliton molecules are typically unstable and evolve toward stationary symmetric or anti-symmetric arrays of vortex streets straightforwardly observable in \emph{cw} experiments. The flexibility of this photonic platform allows implementing more complicated potentials such as maze-like channels, with the vortex streets connecting the entrances and thus solving the maze.