QKD Network Characterisation and Coexistence Datasets with Standardised Performance Metrics and Experimental Methods

This dataset was developed as part of Deliverable D4.2, "Coexistence Datasets with Standardised Performance Metrics and Methods for Quantum Key Distribution Networks Experimental Measurements", and is intended for open-access dissemination and reuse by the research community. This project has received funding from the European Union’s DIGITAL Europe Programme under grant agreement No. 101091520

This dataset presents QKD (Quantum Key Distribution) performance measurements collected on the TCD/CONNECT quantum-classical coexistence testbed, covering
five commercial QKD platforms: a Toshiba MU system, two variants of a Toshiba LE system, IDQ Clavis3, and IDQ ClavisXGR. Measurements span two complementary
experimental campaigns run on the same testbed:

- **Coexistence** — QBER and Secure Key Rate (SKR) for the Toshiba MU system  under classical signal injection and varying fibre length, evaluating how quantum and classical traffic coexist on shared optical infrastructure. (Using data from V1 of this Dataset)
- **Characterisation** — full attenuation-sweep QBER/SKR performance for the  other four systems running standalone (no coexisting classical signal), plus attenuation-transient (perturbation) response testing on the Toshiba LE research system.

Experimental data have been cleaned, curated, and organised into structured CSV files containing measurement-level records and JSON files containing descriptive statistics and summary information. The dataset is accompanied by documentation describing the experimental methodology, data structure, variables, and processing procedures.

The dataset supports reproducible research, benchmarking of QKD coexistence performance, comparative analysis across deployment scenarios, and future studies on the integration of QKD systems into optical communication networks.

Contents:

• Measurement-level datasets (CSV)
• Summary statistics and metadata (JSON)
• Documentation and usage guidelines (README)

Key Variables:

• Quantum Bit Error Rate (QBER)
• Secure Key Rate (SKR)
• Optical attenuation (VOA settings)
• Fibre length (0 km and 50 km)
• External signal injection status (On/Off)

Keywords: Quantum Key Distribution (QKD), Characterisation, Coexistence, Quantum Communications, QBER, Secure Key Rate, Optical Networks, Network Performance, Experimental Dataset, Benchmarking, Fibre Optic Communications.