Exceptional points for photon pairs bound by nonlinear dissipation in cavity arrays

TL;DR

This paper investigates how exceptional points in a dissipative Bose-Hubbard model lead to bound photon pairs, enhancing understanding of non-Hermitian quantum systems and enabling potential applications in nonlinear photonic devices.

Contribution

It introduces the concept of exceptional points in a dissipative cavity array, revealing bound photon pairs formed by nonlinear dissipation, a novel insight into non-Hermitian quantum photonics.

Findings

Identification of exceptional points in the complex energy spectrum.

Formation of bound photon pairs due to nonlinear dissipation.

Potential for on-demand nonlinear light generation.

Abstract

We study theoretically the dissipative Bose-Hubbard model describing array of tunneling-coupled cavities with non-conservative photon-photon interaction. Our calculation of the complex energy spectrum for the photon pairs reveals exceptional points where the two-photon states bound by nonlinear dissipation are formed. This improves fundamental understanding of the interplay of non-Hermiticity and interactions in the quantum structures and can be potentially used for on-demand nonlinear light generation in photonic lattices.