Tailoring a nanofiber for enhanced photon emission and coupling efficiency from single quantum emitters

TL;DR

This paper introduces a nanofiber cavity with a narrow groove to significantly boost photon emission and coupling efficiency from single quantum emitters, advancing fiber-based quantum communication technologies.

Contribution

A novel nanofiber cavity design with an air-filled groove that enhances spontaneous emission and coupling efficiency of single quantum emitters.

Findings

Purcell factor increased by at least six times with the groove.

Coupling efficiency up to 80% achieved with 35 cavity-grating periods.

Potential for efficient photon coupling in fiber-based quantum systems.

Abstract

We present a novel approach to enhance the spontaneous emission rate of single quantum emitters in an optical nanofiber-based cavity by introducing a narrow air-filled groove into the cavity. Our results show that the Purcell factor for single quantum emitters located inside the groove of the nanofiber-based cavity can be at least six times greater than that for such an emitter on the fiber surface when using an optimized cavity mode and groove width. Moreover, the coupling efficiency of single quantum emitters into the guided mode of this nanofiber-based cavity can reach up to $\sim$ 80 $\%$ with only 35 cavity-grating periods. This new system has the potential to act as an all-fiber platform to realize efficient coupling of photons from single emitters into an optical fiber for quantum information applications.