On-chip Hong-Ou-Mandel interference from separate quantum dot emitters in an integrated circuit
Abstract
Scalable quantum photonic technologies require low-loss integration of many identical single-photon sources with photonic circuitry on a chip. Relatively complex quantum photonic circuits have already been demonstrated; however, sources used so far relied on parametric-down-conversion. Hence, the efficiency and scalability are intrinsically limited by the probabilistic nature of the sources. Quantum emitter-based single-photon sources are free of this limitation, but frequency matching of multiple emitters within a single circuit remains a challenge. In this work, we demonstrate a key component in this regard in the form of a fully monolithic GaAs circuit combing two frequency-matched quantum dot single-photon sources interconnected with a low-loss on-chip beamsplitter connected via single-mode ridge waveguides. This device enabled us to perform a two-photon interference experiment on-chip with visibility reaching 66%, limited by the coherence of the emitters. Our device could be further scaled up, providing a clear path to increase the complexity of quantum circuits toward fully scalable integrated quantum technologies.
Cite
@article{arxiv.2301.01706,
title = {On-chip Hong-Ou-Mandel interference from separate quantum dot emitters in an integrated circuit},
author = {Łukasz Dusanowski and Dominik Köck and Christian Schneider and Sven Höfling},
journal= {arXiv preprint arXiv:2301.01706},
year = {2023}
}