To make quantum computing accessible to a broader audience, it is essential to test and evaluate different methodologies and materials in concrete use cases. These prototypes, so-called quantum demonstrators, play a crucial role in advancing the capabilities of quantum computers by enabling their further development and validation in controlled or supervised environments. Within OpenSuperQPlus, four partners, Walther Meißner Institute, Chalmers University, TU Delft, and VTT, are developing different demonstrators that vary in key parameters such as qubit type, number of qubits, and connectivity.
The newly launched Quantum Demonstrator subpage on the OpenSuperQPlus website presents detailed profiles of these demonstrators and allows visitors to compare them directly. This facilitates the identification of strengths and limitations of different quantum systems for specific use cases and helps explore approaches for scaling qubit systems. Moreover, such comparisons support the development of shared metrics and benchmarks across the community. The web portal provides shortcuts to the individual demonstrators, along with guidance on how to access them. It also offers general information, system-level quality metrics, and details on key components such as native and decomposed single- and two-qubit gates. In addition, it includes information on job submission constraints and supported software ecosystems for each demonstrator.
This emphasis on consistent, comparable information reflects one of the central challenges behind the page. As Michael Mucciardi, Senior HPC and Quantum Computing specialist at CSC, explains:
Each partner has its own way of describing its hardware. Therefore, the real challenge in building the Demonstrator subpage template was finding a common vocabulary that respected those differences without losing technical precision. At the same time, the setup needed to remain flexible enough to capture what makes each demonstrator unique while still allowing users to compare them on equal footing. The page enables prospective users to quickly identify which system best fits their experiment, rather than having to piece the information together from separate partner websites. It provides a realistic picture of what each platform can do today and how to start working with it.
Taken together, the Quantum Demonstrator page offers a comprehensive overview of the current state of the art in European superconducting quantum computing technology, and a single point of contact through which future users can reach the teams behind each system.
Visit the Quantum Demonstrator page: https://opensuperqplus.eu/quantum-demonstrators