Fiber-coupled pillar array as a highly pure and stable single-photon source

TL;DR

This paper presents a fiber-coupled pillar array that acts as a highly pure, stable single-photon source with minimal multi-photon probability, suitable for quantum communication applications.

Contribution

The work introduces a novel pillar array design with integrated fiber coupling that maintains high purity and stability under external disturbances.

Findings

Average g^{(2)}(0) value of 0.0174 indicating high single-photon purity

Demonstrated long-term stability against temperature cycles and vibrations

Effective fiber coupling ensuring practical usability

Abstract

A highly pure and stable single-photon source is prepared that comprises a well-designed pillar array in which each pillar contains only a few InAs quantum dots. A nano-pillar in this array is in direct contact with a fiber end surface and cooled in a liquid-He bath. Auto-correlation measurement shows that this source provides an average $g^{(2)}(0)$ value of 0.0174 in the measured excitation-power range. This photon source and fiber coupling are quite rigid against external disturbances such as cooling-heating cycles and vibration, with long-term stability.