Strongly correlated two-photon transport in a one-dimensional waveguide coupled to a weakly nonlinear cavity

TL;DR

This paper investigates how weakly nonlinear cavities influence two-photon transport in a waveguide, revealing that Fano resonance can induce strong photon correlations even with weak nonlinearity.

Contribution

It demonstrates that intrinsic dissipation affects photon correlations and shows that strong correlations can arise via Fano resonance despite weak nonlinear interactions.

Findings

Strong photon-photon correlations are achievable with weak nonlinearity.

Fano resonance causes destructive interference leading to photon correlation.

Dissipation significantly impacts two-photon transport properties.

Abstract

We study the photon-photon correlation properties of two-photon transport in a one-dimensional waveguide coupled to a nonlinear cavity via a real-space approach. It is shown that the intrinsic dissipation of the nonlinear cavity has an important effect upon the correlation of the transported photons. More importantly, strongly correlated photons can be obtained in the transmitted photons even when the nonlinear interaction strength is weak in the cavity. The strong photon-photon correlation is induced by the Fano resonance involving destructive interference between the plane wave and bound state for two-photon transport.