Megabits secure key rate quantum key distribution

TL;DR

This paper demonstrates a high-rate quantum key distribution system over 10 km fiber, achieving 1.3 million secure bits per second, with enhanced security against various quantum attacks.

Contribution

The authors implement a differential phase shift QKD with an up-conversion hybrid photon detector, achieving record secure key rates over fiber with improved attack tolerance.

Findings

Achieved 1.3 M bits/sec secure key rate over 10 km fiber.

Tolerant against PNS, collective, and USD attacks.

Enhanced practical quantum cryptography performance.

Abstract

Quantum cryptography (QC) can provide unconditional secure communication between two authorized parties based on the basic principles of quantum mechanics. However, imperfect practical conditions limit its transmission distance and communication speed. Here we implemented the differential phase shift (DPS) quantum key distribution (QKD) with up-conversion assisted hybrid photon detector (HPD) and achieved 1.3 M bits per second secure key rate over a 10-km fiber, which is tolerant against the photon number splitting (PNS) attack, general collective attacks on individual photons, and any other known sequential unambiguous state discrimination (USD) attacks.