Related papers: On-chip Hong-Ou-Mandel interference from separate quantum dot emitters in an integrated circuit

On-chip Hong-Ou-Mandel interference from separate quantum dot emitters in an integrated circuit

URL: http://arxiv.org/abs/2301.01706v1
Date: Wed, 4 Jan 2023 17:03:04 GMT
Title: On-chip Hong-Ou-Mandel interference from separate quantum dot emitters in an integrated circuit
Authors: {\L}ukasz Dusanowski, Dominik K\"ock, Christian Schneider and Sven H\"ofling
Abstract summary: We show 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.
Score: 0.3096919150448224
License: http://creativecommons.org/licenses/by/4.0/
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.

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