Bright and polarized fiber in-line single photon source based on plasmon-enhanced emission into nanofiber guided modes

TL;DR

This paper presents a fiber-integrated single photon source enhanced by plasmonic nanorods, achieving high brightness, polarization, and purity, suitable for quantum network integration.

Contribution

It introduces a novel plasmon-enhanced emission technique for fiber-coupled single photon sources with improved brightness and polarization.

Findings

Photon count rate of 12.2 MHz achieved

High polarization degree of 94-97%

Single photon purity with g2(0)=0.20

Abstract

We demonstrate a bright and polarized fiber in-line single photon source based on plasmon-enhanced emission of colloidal single quantum dots into an optical nanofiber. We show that emission properties of single quantum dots can be strongly enhanced in the presence of single gold nanorods leading to a bright and strongly polarized single photon emission. The single photons are efficiently coupled to guided modes of the nanofiber and eventually to a single mode optical fiber. The brightness (fiber-coupled photon count rate) of the single photon source is estimated to be 12.2(0.6) MHz, with high single photon purity (g2(0) = 0.20(0.04)) and degree of polarization as high as 94-97%. The present device can be integrated into fiber networks paving the way for potential applications in quantum networks.