Proof-of-Concept of Real-World Quantum Key Distribution with Quantum Frames

TL;DR

This paper presents a fiber-based quantum key distribution system that uses classical framing pulses for synchronization and channel compensation, enabling practical quantum communication with potential for high-rate error correction.

Contribution

It introduces a novel quantum key distribution approach using classical frames for synchronization and channel management, demonstrated through experimental implementation.

Findings

Successful experimental demonstration of the fiber-based QKD system

Effective synchronization and birefringence compensation achieved

Progress towards high-rate error correction protocols

Abstract

We propose and experimentally investigate a fibre-based quantum key distribution system, which employs polarization qubits encoded into faint laser pulses. As a novel feature, it allows sending of classical framing information via sequences of strong laser pulses that precede the quantum data. This allows synchronization, sender and receiver identification, and compensation of time-varying birefringence in the communication channel. In addition, this method also provides a platform to communicate implementation specific information such as encoding and protocol in view of future optical quantum networks. Furthermore, we report on our current effort to develop high-rate error correction.