Freiburg 2024 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 7: Quantum Communication I
Q 7.6: Vortrag
Montag, 11. März 2024, 12:15–12:30, HS 3219
A phase encoding protocol for satellite Quantum Key Distribution — •Kevin Günthner1,2, Conrad Rößler1,2, Bastian Hacker1,2, Ivan Derkach3, Vladyslav Usenko3, and Christoph Marquardt1,2 — 1Lehrstuhl für Optische Quantentechnologien, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstr. 7, 91058 Erlangen, Germany — 2Max Planck Institute for the Science of Light, Staudtstr. 2, 91058 Erlangen, Germany — 3Department of Optics, Faculty of Science, Palacky University, 17. listopadu 12, 77146 Olomouc, Czech Republic
We report on a novel Quantum Key Distribution (QKD) protocol using relative phase encoding designed and optimized for operational satellite QKD. The protocol is based on the BB84 decoy-state protocol. Its security proof is based on the rigorous finite-size techniques [1] extended by several security aspects of the practical implementation. Besides the quantum state exchange for key creation, the protocol contains two additional time multiplexed parts: a few states at quantum level with deterministic phases and intensities to obtain a live reference error rate and bright reference signals used for Doppler effect compensation, clock recovery and bit synchronization with the satellite (without the need for an absolute time reference) as well as for phase locking of the receiving interferometers [2]. With this approach, the quantum signal train is self-contained and requires no additional reference signals for QKD operation simplifying the practical implementation.
[1] Z. Zhang et al., PRA 95, 012333 (2017)
[2] B. Hacker et al., New J. Physics 25, 113007 (2023)
Keywords: Quantum Key Distribution; Quantum Communication; Satellite; Protocol; Phase Encoding