Simple 2.5 GHz time-bin quantum key distribution
Alberto Boaron, Boris Korzh, Raphael Houlmann, Gianluca Boso, Davide, Rusca, Stuart Gray, Ming-Jun Li, Daniel Nolan, Anthony Martin, Hugo Zbinden

TL;DR
This paper demonstrates a high-speed 2.5 GHz quantum key distribution system using a simple setup, achieving record secret key rates over long distances with practical components.
Contribution
It introduces a straightforward experimental design for high-rate QKD using a three-state time-bin protocol with efficient decoy and finite-key analysis.
Findings
Record secret key rate of 1.5 kbps over 200 km fiber
Simple experimental setup with a pulsed diode laser and single modulator
Effective implementation of decoy scheme and finite-key analysis
Abstract
We present a 2.5 GHz quantum key distribution setup with the emphasis on a simple experimental realization. It features a three-state time-bin protocol based on a pulsed diode laser and a single intensity modulator. Implementing an efficient one-decoy scheme and finite-key analysis, we achieve record breaking secret key rates of 1.5 kbps over 200 km of standard optical fiber.
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