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Fully integrated four-channel wavelength-division multiplexed QKD receiver

Quantum key distribution (QKD) enables secure communication even in the presence of advanced quantum computers. However, scaling up discrete-variable QKD to high key rates remains a challenge due to the lossy nature of quantum communication channels and the use of weak coherent states. Photonic inte...

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Bibliographic Details
Main Authors: Beutel, Fabian (Author) , Brückerhoff-Plückelmann, Frank (Author) , Gehring, Helge (Author) , Kovalyuk, Vadim (Author) , Zolotov, Philipp (Author) , Goltsman, Gregory (Author) , Pernice, Wolfram (Author)
Format: Article (Journal)
Language:English
Published: 30 September 2022
In: Optica
Year: 2022, Volume: 9, Issue: 10, Pages: 1121-1130
ISSN:2334-2536
DOI:10.1364/OPTICA.468982
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1364/OPTICA.468982
Verlag, lizenzpflichtig, Volltext: https://opg.optica.org/optica/abstract.cfm?uri=optica-9-10-1121
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Author Notes:Fabian Beutel, Frank Brückerhoff-Plückelmann, Helge Gehring, Vadim Kovalyuk, Philipp Zolotov, Gregory Goltsman, and Wolfram H.P. Pernice
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Summary:Quantum key distribution (QKD) enables secure communication even in the presence of advanced quantum computers. However, scaling up discrete-variable QKD to high key rates remains a challenge due to the lossy nature of quantum communication channels and the use of weak coherent states. Photonic integration and massive parallelization are crucial steps toward the goal of high-throughput secret-key distribution. We present a fully integrated photonic chip on silicon nitride featuring a four-channel wavelength-division demultiplexed QKD receiver circuit including state-of-the-art waveguide-integrated superconducting nanowire single-photon detectors (SNSPDs). With a proof-of-principle setup operated at a clock rate of 3.35 GHz, we achieve a total secret-key rate of up to 12.17 Mbit/s at 10 dB channel attenuation with low detector-induced error rates. The QKD receiver architecture is massively scalable and constitutes a foundation for high-rate many-channel QKD transmission.
Item Description:Gesehen am 23.01.2023
Physical Description:Online Resource
ISSN:2334-2536
DOI:10.1364/OPTICA.468982

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