Fiber-coupled single photon sources are essential components of photonics-based quantum information processors. Most fiber-coupled single photon sources require careful alignment between fibers and quantum emitters. In this work, we present an alignment-free fiber-integrated single photon source based on an InAs/InP quantum dot emitting at telecom wavelengths. We designed a nanobeam containing the quantum dots attached to a fiber taper. The adiabatic tapered coupler of the nanobeam enables efficient light coupling to the fiber taper. Using a tungsten probe in a focused ion beam system, we transferred the nanobeam to the fiber taper. The observed fiber-coupled single photon emission occurs with a brightness of 1.5% and purity of 86%. This device provides a building block for fiber-optic quantum circuits that have various applications, such as quantum communication and distributed quantum computing.
@article{arxiv.1902.05150,
title = {A fiber-integrated single photon source emitting at telecom wavelengths},
author = {Chang-Min Lee and Mustafa Atabey Buyukkaya and Shahriar Aghaeimeibodi and Christopher J. K. Richardson and Edo Waks},
journal= {arXiv preprint arXiv:1902.05150},
year = {2023}
}