A narrow-band sodium-resonant fiber-coupled single photon source

TL;DR

This paper reports a fiber-coupled single photon source using a cooled single molecule, demonstrating narrow linewidth, single-photon emission, and coherent Rabi oscillations, advancing quantum communication technologies.

Contribution

It introduces a fiber-coupled single molecule photon source with narrow linewidth and coherent control at cryogenic temperatures, a novel integration for quantum applications.

Findings

Narrow linewidth fluorescence at liquid-helium temperatures.

Single-photon emission confirmed by anti-bunching.

Observation of coherent Rabi oscillations.

Abstract

Quantum technology requires the creation and control over single photons as an important resource. We present a single photon source based on a single molecule which is attached to the end-facet of an optical fiber. To realize a narrow linewidth, the system is cooled down to liquid-helium temperatures. The molecule is optically excited and its fluorescence is collected through the fiber. We have recorded an excitation spectrum, a saturation curve and analyzed the contributions of Raman background fluorescence. This presents to date the crucial limit for the introduced device. The single photon nature is proven by an anti-bunched auto-correlation recording, which also shows coherent Rabi oscillations.