Single-photon blockade in doubly resonant nanocavities with second-order nonlinearity

TL;DR

This paper proposes using doubly resonant nanocavities made of second-order nonlinear materials to generate single photons through photon blockade, offering a passive, on-demand single-photon source with current nanofabrication techniques.

Contribution

It introduces a novel scheme utilizing doubly resonant nanocavities with second-order nonlinearity for passive single-photon generation, advancing quantum photonics technology.

Findings

Feasibility of the scheme with current nanofabrication technology

Potential for on-demand single-photon source

Enhanced photon blockade effect in doubly resonant cavities

Abstract

We propose the use of nanostructured photonic nanocavities made of second-order nonlinear materials as prospective passive devices to generate strongly sub-Poissonian light via single-photon blockade of an input coherent field. The simplest scheme is based on the requirement that the nanocavity be doubly resonant, i.e. possess cavity modes with good spatial overlap at both the fundamental and second-harmonic frequencies. We discuss feasibility of this scheme with state-of-the art nanofabrication technology, and the possibility to use it as a passive single-photon source on-demand.