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Optical Fiber Communication Conference

538 Mb/s Integrated Continuous-Variable Quantum Key Distribution System

Axl Bomhals, Adnan A. E. Hajomer, Cédric Bruynsteen, Aboobackkar Sidhique, Olena Kovalenko, Ivan D. Derkach, Vladyslav C. Usenko, Ulrik L. Andersen, Tobias Gehring, Xin Liang Yin

Published Jan 1, 2026• 0 citations
Publisher

Abstract

We demonstrate a spectrally efficient 10 GBaud continuous-variable quantum key distribution (CVQKD) system with fully photonic-integrated transmitter and receiver, achieving a high asymptotic secret key rate of 538 Mb/s over a 10 km fiber link.
DOI
10.1364/ofc.2026.m1k.2

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Quantum key distribution (QKD) is a widely recognized application of quantum information theory, guaranteeing information-theoretically secure key exchange. However, commercial viability of QKD systems is currently impeded by issues such as scalability, network integration, and high manufacturing costs. Low-cost, high-volume production of photonic and electronic integrated circuits could be the breakthrough needed for broad-scale deployment of cutting-edge QKD systems. Here, we present a continuous-variable (CV) QKD system that is based on an integrated photonic-electronic receiver. It combines a silicon photonic integrated circuit, featuring a phase-diverse receiver, with custom-designed GaAs pHEMT transimpedance amplifiers. Operating at a classical telecom symbol rate of 10 GBaud, our QKD system generates high secret key rates - exceeding 0.7 Gb/s over a 5 km distance and 0.3 Gb/s over a 10 km. The secret keys are secure against collective attacks, even when accounting for finite-size effects in the parameter estimation, thanks to well-designed digital signal processing that enables broadband system operation. Our experiment sets a record for secure key exchange and paves the way for the implementation of real-time broadband CV-QKD systems.
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