InAs/InP quantum dot based C-Band all-fiber plug-and-play triggered single-photon source integrated using micro-transfer printing

TL;DR

This paper presents a robust, integrated, all-fiber single-photon source operating in the telecom C-band, using InAs/InP quantum dots and micro-transfer printing, suitable for long-distance quantum communication.

Contribution

It introduces a novel integration of InAs/InP quantum dots with fiber optics via micro-transfer printing, enabling stable, plug-and-play quantum light sources in the telecom band.

Findings

Single-photon emission with $g^{(2)}(0)=0.14$ demonstrating non-classical light.

Stable emission with low intensity fluctuations ($\sigma=0.13$).

Successful fiber-based quantum channel testing in the telecom C-band.

Abstract

Fiber-based long-haul quantum communication would greatly benefit from a robust and deterministically integrated source of quantum state. Here, we report the design, fabrication, and optical characterization of InAs/InP quantum dots in the InP H1 point defect 2D photonic crystal cavity, integrated with the standard single-mode fiber using a micro-transfer printing technique. The device was placed in a compact cryocooler maintaining a cryogenic temperature of 15 K with single-photon emission characterized by $g^{(2)}(0)=0.14(14)$ and reliable and stable emission (intensity fluctuations given by a standard deviation $\sigma = 0.13$), so that an all-fiber based connection between two laboratory nodes through an open area was established and utilized for testing the quantum channel. In this way, we demonstrate a plug-and-play all-fiber single-photon source operating in the third telecom window, where standard telecommunication fiber networks can be used as a low-loss medium.