High-throughput quantum photonic devices emitting indistinguishable photons in the telecom C-band

Paweł Holewa (), Daniel A. Vajner, Emilia Zięba-Ostój, Maja Wasiluk, Benedek Gaál, Aurimas Sakanas, Marek Burakowski, Paweł Mrowiński, Bartosz Krajnik, Meng Xiong, Kresten Yvind, Niels Gregersen, Anna Musiał, Alexander Huck, Tobias Heindel, Marcin Syperek () and Elizaveta Semenova ()
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Paweł Holewa: Wrocław University of Science and Technology
Daniel A. Vajner: Technische Universität Berlin
Emilia Zięba-Ostój: Wrocław University of Science and Technology
Maja Wasiluk: Wrocław University of Science and Technology
Benedek Gaál: Technical University of Denmark
Aurimas Sakanas: Technical University of Denmark
Marek Burakowski: Wrocław University of Science and Technology
Paweł Mrowiński: Wrocław University of Science and Technology
Bartosz Krajnik: Wrocław University of Science and Technology
Meng Xiong: Technical University of Denmark
Kresten Yvind: Technical University of Denmark
Niels Gregersen: Technical University of Denmark
Anna Musiał: Wrocław University of Science and Technology
Alexander Huck: Technical University of Denmark
Tobias Heindel: Technische Universität Berlin
Marcin Syperek: Wrocław University of Science and Technology
Elizaveta Semenova: Technical University of Denmark

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Single indistinguishable photons at telecom C-band wavelengths are essential for quantum networks and the future quantum internet. However, high-throughput technology for single-photon generation at 1550 nm remained a missing building block to overcome present limitations in quantum communication and information technologies. Here, we demonstrate the high-throughput fabrication of quantum-photonic integrated devices operating at C-band wavelengths based on epitaxial semiconductor quantum dots. Our technique enables the deterministic integration of single pre-selected quantum emitters into microcavities based on circular Bragg gratings. Respective devices feature the triggered generation of single photons with ultra-high purity and record-high photon indistinguishability. Further improvements in yield and coherence properties will pave the way for implementing single-photon non-linear devices and advanced quantum networks at telecom wavelengths.

Date: 2024
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DOI: 10.1038/s41467-024-47551-7

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