Enhancing quantum cryptography with quantum dot single-photon sources

Autor(en)

Mathieu Bozzio, Michal Vyvlecka, Michael Cosacchi, Cornelius Nawrath, Tim Seidelmann, Juan C. Loredo, Simone L. Portalupi, Vollrath M. Axt, Peter Michler, Philip Walther

Abstrakt

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.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Universität Bayreuth, Universität Stuttgart, Vienna Center for Quantum Science and Technology (VCQ)

Journal

npj Quantum Information

Band

8

Anzahl der Seiten

8

ISSN

2056-6387

DOI

https://doi.org/10.1038/s41534-022-00626-z

Publikationsdatum

09-2022

Peer-reviewed

Ja

ÖFOS 2012

103025 Quantenmechanik, 103026 Quantenoptik

Schlagwörter

ASJC Scopus Sachgebiete

Computer Science (miscellaneous), Statistical and Nonlinear Physics, Computer Networks and Communications, Computational Theory and Mathematics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/71815f80-4a0d-47b1-bc6d-3fe583cab22d