Simple and high-speed polarization-based QKD

Abstract

We present a simplified BB84 protocol with only three quantum states and one decoy-state level. We implement this scheme using the polarization degree of freedom at telecom wavelength. Only one pulsed laser is used in order to reduce possible side-channel attacks. The repetition rate of 625 MHz and the achieved secret bit rate of 23 bps over 200 km of standard fiber are the actual state of the art.

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• In-Field Comparison between G.652 and G.655 Optical Fibers for Polarization-Based Quantum Key Distribution
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• Ultrastable, low-error dynamic polarization encoding of deterministically generated single photons
• Deployment-ready quantum key distribution over a classical network infrastructure in Padua
• Quantum Key Distribution with Imperfections: Recent Advances in Security Proofs
• Countermeasures for Trojan-Horse Attacks on self-compensating all-fiber polarization modulator