Mirror-mediated long-range coupling and robust phase locking of spatially separated exciton-polariton condensates

Lattice arrays are valuable simulators for complex mathematical problems, but physical systems typically allow only short-range coupling.

We demonstrate a method for independently tunable, long-range interactions between polariton condensates in two-dimensional lattices by using vertical emission and external imaging to couple arbitrary sites.

Two geometrically isolated condensates are phase-locked without planar coupling, verified via phase-resolved interferometry.

Analytical modeling reveals mechanisms for robust coherence.

The mirror-based scheme, free of cameras or modulators, offers a pure, high-bandwidth analogt element.

Extension to dense graphs via segmented micro-mirrors is limited only by imaging optics, enabling scalable, energy-efficient polaritonic hardware for neuromorphic computation.