Co-propagation of Classical and Continuous-variable QKD Signals over a Turbulent Optical Channel with a Real-time QKD Receiver

TL;DR

This paper demonstrates the simultaneous transmission of classical and quantum signals over a turbulent free-space optical channel, achieving high throughput and secret-key rates, with a real-time GPU-based receiver evaluating quantum signal integrity under turbulence.

Contribution

It introduces a real-time GPU-based receiver for co-propagating classical and quantum signals in turbulent conditions, achieving record secret-key rates.

Findings

Achieved 3 Tbit/s classical throughput.

Recorded 2.7 Mbit/s secret-key rate.

Assessed quantum signal integrity under turbulence.

Abstract

We demonstrate classical and quantum signal co-propagation over a turbulent free-space channel with 3 Tbit/s throughput and record 2.7 Mbit/s secret-key rate. Our real-time GPU-based receiver assessed quantum signal integrity under different turbulence scenarios for the first time.