This funding call, under the Horizon Europe program, focuses on advancing quantum computing technology through the development of a universal, hardware-agnostic software stack. The aim is to establish a robust and interoperable quantum computing ecosystem capable of supporting diverse quantum hardware platforms while integrating seamlessly with classical computing systems such as HPC and cloud services.

The call encourages the creation of open-source tools, libraries, and interfaces that will allow application portability and performance optimization across different quantum platforms. A strong emphasis is placed on collaboration between projects to standardize software interfaces and foster synergies with existing European quantum initiatives, such as the EuroHPC Joint Undertaking and Quantum Excellence Centres.

Key expected advancements include demonstrating quantum-classical workflows to tackle complex computational challenges, training developers in quantum programming, and developing libraries for basic quantum algorithms, including error correction mechanisms. All results must adhere to open-access principles, utilizing licenses aligned with the Free Software Foundation and Open Source Initiative.

Proposals should build on existing projects or establish collaborations with European, national, and regional initiatives. They must also ensure the involvement of EU Widening Countries to spread excellence across Europe.

With a total indicative budget of 10.00 million €, this call aims to propel quantum computing into practical applications while reinforcing Europe’s leadership in the global quantum technology race. Activities are expected to begin at TRL 3-4 and reach TRL 5-6 by the project’s conclusion.

Opening: 10 Jun 2025

Deadline(s): 13 Nov 2025