Effect of pure dephasing on the Jaynes-Cummings nonlinearities

TL;DR

This paper investigates how pure dephasing influences the nonlinear strong-coupling regime of a quantum dot-microcavity system, revealing persistent triplet spectral features and potential experimental signatures of single-photon nonlinearities.

Contribution

It demonstrates that pure dephasing causes the photoluminescence spectrum to favor triplet structures over traditional Jaynes-Cummings doublets in the nonlinear regime.

Findings

Spectral triplet structures are robust against pure dephasing.

Current experiments may already observe single-photon nonlinearities.

Pure dephasing alters the expected Jaynes-Cummings spectral features.

Abstract

We study the effect of pure dephasing on the strong-coupling between a quantum dot and the single mode of a microcavity in the nonlinear regime. We show that the photoluminescence spectrum of the system has a robust tendency to display triplet structures, instead of the expected Jaynes-Cummings pairs of doublets at the incommensurate frequencies $\pm(\sqrt{n}\pm\sqrt{n-1})$ for integer $n$. We show that current experimental works may already manifest signatures of single photon nonlinearities.