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Enhancing quantum cryptography with quantum dot single-photon sources

Enhancing quantum cryptography with quantum dot single-photon sources

Authors :
Mathieu Bozzio
Michal Vyvlecka
Michael Cosacchi
Cornelius Nawrath
Tim Seidelmann
Juan C. Loredo
Simone L. Portalupi
Vollrath M. Axt
Peter Michler
Philip Walther
Source :
npj Quantum Information, Vol 8, Iss 1, Pp 1-8 (2022)
Publication Year :
2022
Publisher :
Nature Portfolio, 2022.

Abstract

Abstract Quantum cryptography harnesses quantum light, in particular single photons, to provide security guarantees that cannot be reached by classical means. For each cryptographic task, the security feature of interest is directly related to the photons’ non-classical properties. Quantum dot-based single-photon sources are remarkable candidates, as they can in principle emit deterministically, with high brightness and low multiphoton contribution. Here, we show that these sources provide additional security benefits, thanks to the tunability of coherence in the emitted photon-number states. We identify the optimal optical pumping scheme for the main quantum-cryptographic primitives, and benchmark their performance with respect to Poisson-distributed sources such as attenuated laser states and down-conversion sources. In particular, we elaborate on the advantage of using phonon-assisted and two-photon excitation rather than resonant excitation for quantum key distribution and other primitives. The presented results will guide future developments in solid-state and quantum information science for photon sources that are tailored to quantum communication tasks.

Details

Language :
English
ISSN :
20566387
Volume :
8
Issue :
1
Database :
Directory of Open Access Journals
Journal :
npj Quantum Information
Publication Type :
Academic Journal
Accession number :
edsdoj.44734785b9544f74aa398fbd5caa8aaf
Document Type :
article
Full Text :
https://doi.org/10.1038/s41534-022-00626-z