Title
Enhancing quantum cryptography with quantum dot single-photon sources
Author
Michael Cosacchi
Theoretische Physik III, Universität Bayreuth
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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.
Keywords
Quantum informationSingle photons and quantum effects
Object type
Language
English [eng]
Persistent identifier
https://phaidra.univie.ac.at/o:1671476
Appeared in
Title
npj Quantum Information
Volume
8
Issue
1
ISSN
2056-6387
Issued
2022
Publisher
Springer Science and Business Media LLC
Date issued
2022
Access rights
Rights statement
© The Author(s) 2022
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