Symbiotic joint operation of quantum and classical coherent communications

TL;DR

This paper demonstrates the successful integration of quantum and classical communications using shared hardware, achieving low-noise quantum data transmission compatible with high-rate QKD.

Contribution

It introduces a method for joint quantum-classical communication operation leveraging classical DSP insights, enabling practical quantum communication with classical systems.

Findings

Quantum communication noise level of 0.009 SNU at 15 km

Compatibility with 15 Mbit/s QKD achieved

Shared hardware operation demonstrated

Abstract

We report successful joint operation of quantum and classical communications with shared hardware. Leveraging information learned from the classical DSP, low-noise quantum communications (0.009 SNU at 15 km) compatible with 15 Mbit/s QKD is demonstrated.