Quantum random number generation for 1.25 GHz quantum key distribution systems

TL;DR

This paper demonstrates a high-speed quantum random number generator operating at 1.25 Gbps, suitable for GHz-range quantum key distribution systems, using amplified spontaneous emission and FPGA-based extraction.

Contribution

It introduces a practical, high-speed quantum random number generator integrated with QKD systems, achieving real-time provably random bits at 1.25 Gbps.

Findings

Achieved 1.25 Gbps random bit generation rate

Integrated the RNG with standard SFP modules and FPGA

Provided provably random bits suitable for high-speed QKD

Abstract

Security proofs of quantum key distribution (QKD) systems usually assume that the users have access to source of perfect randomness. State-of-the-art QKD systems run at frequencies in the GHz range, requiring a sustained GHz rate of generation and acquisition of quantum random numbers. In this paper we demonstrate such a high speed random number generator. The entropy source is based on amplified spontaneous emission from an erbium-doped fibre, which is directly acquired using a standard small form-factor pluggable (SFP) module. The module connects to the Field Programmable Gate Array (FPGA) of a QKD system. A real-time randomness extractor is implemented in the FPGA and achieves a sustained rate of 1.25 Gbps of provably random bits.