Demonstration of Probabilistic Constellation Shaping for Continuous Variable Quantum Key Distribution

TL;DR

This paper demonstrates a novel continuous-variable quantum key distribution method using probabilistic constellation shaping with 1024-QAM, achieving high secret key rates over a 9.5 km fiber link.

Contribution

It introduces probabilistic constellation shaping into CV-QKD with true local oscillator, achieving record secret key rates over practical distances.

Findings

Achieved 38.3 Mb/s secret key rate over 9.5 km

First demonstration of probabilistic constellation shaping in CV-QKD

Validated effectiveness of true local oscillator in high-rate CV-QKD

Abstract

We demonstrate, for the first time to our knowledge, continuous-variable quantum key distribution using probabilistically-shaped 1024-QAM and true local oscillator, achieving 38.3Mb/s secret key rate over 9.5km, averaged over the transmission time of 100 blocks.