Towards fast quantum key distribution with quantum frames

TL;DR

This paper introduces a fibre-based quantum key distribution system using polarization qubits and classical framing to enable high-speed, synchronized quantum communication suitable for future optical quantum networks.

Contribution

It presents a novel quantum key distribution method that integrates classical framing information for synchronization and channel compensation, enabling Gbps operation.

Findings

Supports high-speed quantum key distribution at Gbps rates

Allows synchronization and channel compensation via classical framing

Facilitates communication of implementation details for quantum networks

Abstract

We propose and 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. Furthermore, this method also provides a platform to communicate implementation specific information such as encoding and protocol in view of future optical quantum networks. All optical components can be operated at Gbps rates, which is a first requirement for Mbps secret key rates.