Dispersion-engineered $\chi^{(2)}$ nanophotonics: a flexible tool for nonclassical light

TL;DR

This paper reviews recent advances in dispersion-engineered $$ nanophotonics, highlighting design principles and applications in non-classical light sources, with potential impacts on quantum computing and single-photon technologies.

Contribution

It establishes design rules for dispersion-engineered nonlinear interactions and demonstrates their advantages in creating non-classical light sources in nanophotonics.

Findings

Dispersion-engineered devices outperform conventional counterparts in non-classical light generation.

Ultra-broadband optical parametric amplification enables measurement-based quantum computation.

Synchronous pumped nonlinear resonators offer a route to single-photon nonlinearities.

Abstract

This article reviews recent progress in quasi-phasematched $\chi^{(2)}$ nonlinear nanophotonics, with a particular focus on dispersion-engineered nonlinear interactions. Throughout this article, we establish design rules for the bandwidth and interaction lengths of various nonlinear processes, and provide examples for how these processes can be engineered in nanophotonic devices. In particular, we apply these rules towards the design of sources of non-classical light and show that dispersion-engineered devices can outperform their conventional counterparts. Examples include ultra-broadband optical parametric amplification as a resource for measurement-based quantum computation, dispersion-engineered spontaneous parametric downconversion as a source of separable biphotons, and synchronously pumped nonlinear resonators as a potential route towards single-photon nonlinearities.