Robust excitation of C-band quantum dots for quantum communication

Author(s)
Michal Vyvlecka, Lennart Jehle, Cornelius Nawrath, Francesco Giorgino, Mathieu Bozzio, Robert Sittig, Michael Jetter, Simone L. Portalupi, Peter Michler, Philip Walther
Abstract

Building a quantum internet requires efficient and reliable quantum hardware, from photonic sources to quantum repeaters and detectors, ideally operating at telecommunication wavelengths. Thanks to their high brightness and single-photon purity, quantum dot (QD) sources hold the promise to achieve high communication rates for quantum-secured network applications. Furthermore, it was recently shown that excitation schemes such as longitudinal acoustic phonon-assisted (LA) pumping provide security benefits by scrambling the coherence between the emitted photon-number states. In this work, we investigate further advantages of LA-pumped quantum dots with emission in the telecom C-band as a core hardware component of the quantum internet. We experimentally demonstrate how varying the pump power and spectral detuning with respect to the excitonic transition can improve quantum-secured communication rates and provide stable emission statistics regardless of network-environment fluctuations. These findings have significant implications for general implementations of QD single-photon sources in practical quantum communication networks.

Organisation(s)
Quantum Optics, Quantum Nanophysics and Quantum Information
External organisation(s)
Universität Stuttgart
Journal
Applied Physics Letters
Volume
123
No. of pages
7
ISSN
0003-6951
DOI
https://doi.org/10.1063/5.0166285
Publication date
10-2023
Peer reviewed
Yes
Austrian Fields of Science 2012
103026 Quantum optics
ASJC Scopus subject areas
Physics and Astronomy (miscellaneous)
Portal url
https://ucrisportal.univie.ac.at/en/publications/robust-excitation-of-cband-quantum-dots-for-quantum-communication(446db9f2-d0fe-475b-95ef-6bfdfa8f49b9).html