The EuroQHPC-Integration project aims to perform the coupling between six quantum computers and six existing supercomputers:

• VLQ, a 24-qubit star-shaped topology superconducting transmon-based quantum computer with KAROLINA, hosted at IT4Innovation in Ostrava (Czech Republic);
• Lucy, a 12-qubit photonic quantum computer with Joliot-Curie, hosted at TGCC in Bruyères-le-Châtel (France);
• A 54-qubit and a 150-qubit superconducting quantum computer with SuperMUC-NG-2, hosted at LRZ in Garching near Munich (Germany);
• A 140-qubit neutral atom quantum computer with Leonardo, hosted at CINECA in Bologna (Italy);
• Piast-Q, a 20-qubit trapped-ion quantum computer with Altaïr, hosted at PCSS in Poznan (Poland);
• MareNostrum Ona analogue partition, an up to 25-qubit quantum annealing device based on superconducting circuits integrated with MareNostrum5 supercomputer, hosted at the BSC-CNS in Barcelona (Spain).

The EuroHPC Joint Undertaking and its partners are building a European hybrid HPC-QC infrastructure, dedicated to open research. Building on the first integration of two 100+-qubit neutral atom quantum simulators with two European supercomputers through the HPCQS project, EuroQHPC-Integration aims at fostering harmonization across the various components of this shared infrastructure.

Mutualisation of efforts will cover:

• Harmonization of the user and developer experience;
• Shared experience across the application development support teams and experts from the various partner organization;
• Joint collection of benchmarking applications to assess performances of the different quantum computing and hybrid quantum-classical architectures;
• Connection with national and international standardisation and normalisation bodies.