A telecom band single-photon source using a grafted carbon nanotube coupled to a fiber Fabry-Perot cavity in the Purcell regime

TL;DR

This paper demonstrates a tunable single-photon source at telecom wavelengths using a grafted carbon nanotube coupled to a fiber micro-cavity, achieving high emission rates and strong cavity quantum electrodynamical effects.

Contribution

It introduces a novel telecom-band single-photon source based on a grafted carbon nanotube coupled to a fiber cavity, with detailed characterization of its quantum electrodynamical properties.

Findings

Single-photon output rate up to 20 MHz at 1275 nm

Purcell factor up to 30 for small mode volumes

Vacuum Rabi splitting up to 25 μeV

Abstract

We report on the coupling of a reconfigurable high Q fiber micro-cavity to an organic color center grafted to a carbon nanotube for telecom wavelength emission of single photons in the Purcell regime. Using three complementary approaches we assess various figures of merit of this tunable single photon source and of the cavity quantum electrodynamical effects : the brightening of the emitter is obtained by comparison of the count rates of the very same emitter in free-space and cavity coupled regimes. We demonstrate a fiber coupled single-photon output rate up to 20 MHz at 1275~nm. Using time-resolved and saturation measurements, we determine independently the radiative quantum yield and the Purcell factor of the system with values up to 30 for the smallest mode volumes. Finally, we take advantage of the tuning capability of the cavity to measure the spectral profile of the brightness of the source which gives access to the vacuum Rabi splitting $g$ with values up to $25 \; \mu$eV.