Efficient demultiplexed single-photon source with a quantum dot coupled to a nanophotonic waveguide

Thomas Hummel; Clauderic Ouellet-Plamondon; Ela Ugur; Irina Kulkova; Toke Lund-Hansen; Matthew A. Broome; Ravitej Uppu; Peter Lodahl

doi:10.1063/1.5096979

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Efficient demultiplexed single-photon source with a quantum dot coupled to a nanophotonic waveguide

Journal article

Peer reviewed

Efficient demultiplexed single-photon source with a quantum dot coupled to a nanophotonic waveguide

Thomas Hummel, Clauderic Ouellet-Plamondon, Ela Ugur, Irina Kulkova, Toke Lund-Hansen, Matthew A. Broome, Ravitej Uppu and Peter Lodahl

Applied physics letters, Vol.115(2), 021102

07/08/2019

DOI: 10.1063/1.5096979

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Abstract

Planar nanostructures allow near-ideal extraction of emission from a quantum emitter embedded within, thereby realizing deterministic single-photon sources. Such a source can be transformed into M single-photon sources by implementing active temporal-to-spatial mode demultiplexing. We report on the realization of such a demultiplexed source based on a quantum dot embedded in a nanophotonic waveguide. Efficient out-coupling (>60%) from the waveguide into a single mode optical fiber is obtained with high-efficiency grating couplers. As a proof-of-concept, active demultiplexing into M = 4 spatial channels is demonstrated by the use of electro-optic modulators with an end-to-end efficiency of >81% into single-mode fibers. Overall, we demonstrate four-photon coincidence rates of >1Hz even under nonresonant excitation of the quantum dot. The main limitation of the current source is the residual population of other exciton transitions, which corresponds to a finite preparation efficiency of the desired transition. We quantitatively extract a preparation efficiency of 15% using the second-order correlation function measurements. The experiment highlights the applicability of planar nanostructures as efficient multiphoton sources through temporal-to-spatial demultiplexing and lays out a clear path way of how to scale up toward demonstrating quantum advantages with the quantum dot sources. Published under license by AIP Publishing.

Physical Sciences

Physics

Physics, Applied

Science & Technology

Details

Title: Subtitle: Efficient demultiplexed single-photon source with a quantum dot coupled to a nanophotonic waveguide
Creators: Thomas Hummel - University of Copenhagen
Clauderic Ouellet-Plamondon - University of Copenhagen
Ela Ugur - University of Copenhagen
Irina Kulkova - Sparrow Quantum, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
Toke Lund-Hansen - Sparrow Quantum, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
Matthew A. Broome - University of Copenhagen
Ravitej Uppu - University of Copenhagen
Peter Lodahl - University of Copenhagen
Resource Type: Journal article
Publication Details: Applied physics letters, Vol.115(2), 021102
DOI: 10.1063/1.5096979
ISSN: 0003-6951
eISSN: 1077-3118
Publisher: Amer Inst Physics
Number of pages: 5
Grant note: Europe Research Council (ERC Advanced Grant "SCALE") Innovation Fund Denmark (Quantum Innovation Center "Qubiz") Danish Research Infrastructure Grant (QUANTECH) Danish National Research Foundation (Center of Excellence "Hy-Q") Horizon2020 (Marie-Sklowdowska Curie Individual Fellowship)
Language: English
Date published: 07/08/2019
Academic Unit: Physics and Astronomy
Record Identifier: 9984442015602771

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