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Enhancing quantum cryptography with quantum dot single-photon sources

Title data

Bozzio, Mathieu ; Vyvlecka, Michal ; Cosacchi, Michael ; Nawrath, Cornelius ; Seidelmann, Tim ; Loredo, Juan C. ; Portalupi, Simone L. ; Axt, Vollrath Martin ; Michler, Peter ; Walther, Philip:
Enhancing quantum cryptography with quantum dot single-photon sources.
In: npj Quantum Information. Vol. 8 (2022) . - No. 104.
ISSN 2056-6387
DOI: https://doi.org/10.1038/s41534-022-00626-z

Project information

Project financing: Bundesministerium für Bildung und Forschung
Deutsche Forschungsgemeinschaft
European Commission through UNIQORN (no. 820474), AFOSR via Q-TRUST (FA9550-21-1-0355), Austrian Science Fund (FWF) through BeyondC (F7113) and Reseach Group (FG5), Austrian Federal Ministry for Digital and Economic Affairs, National Foundation for Research, Technology and Development, Christian Doppler Research Association and Project No. EMPIR 20FUN05 SEQUME.

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: key distribution; key generation; key security; quantum dots; Fock state coherences
Subject classification: quantum information and condensed matter physics (theoretical)
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 19 Sep 2022 07:40
Last Modified: 19 Sep 2022 07:40
URI: https://eref.uni-bayreuth.de/id/eprint/71901