WP1 focuses on low-background technologies and procedures to reduce radioactive contamination and improve screening, material selection, and protocols for underground experiments.

The Deep Underground Labs (DULs) have provided material characterisation measurements to a substantial number of experiments over a number of years whilst R&D and knowledge exchange has helped to increase sensitivity and uniformity in this time. As we move toward the next generation of low-background particle physics project, such as large-scale dark matter or neutrinoless double beta decay experiments, the throughput and sensitivity needed will increase further. The expertise acquired by scientists of the underground laboratories allows them to develop in the DULs radiopure materials when a commercial alternative is not available: this is the case for interposers for electronic circuits. The standard printed circuit boards (PCB) are based on relatively radiopure epoxies reinforced with fiber fabrics (glass, kevlar, carbon, liquid crystal elastomers). These fabrics, even when based on clean materials, are strongly contaminated by radiogenic elements, given their high exposed surface. Most experiments use polyimide derived substrates (CIRLEX): while the substrate is radiopure, the PCB is typically contaminated with lead during the production. Furthermore, polyimide has very bad adhesion and no rigidity, both causing problems in the use. Interposer techniques based on metal film deposition on radiopure substrates(like fused silica) are more promising for the electronic circuits of future low background experiments. Furthermore, it will be possible to produce non-planar radiopure circuits by integrating the most modern additive manufacturing techniques for alumina/zirconia and the film deposition facilities that are being planned at INFN (LNGS). The main objectives are:

• O1.1 : DUL background reduction and mitigation strategy
• O1.2 Reinforce and innovate the development of assay techniques
• O1.3 Exploiting pulse shape discrimination to improve gamma spectrometry sensitivities
• O1.4 Define protocols for building radiopure electronic circuits

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WP2 addresses underground background characterization, including neutron and radiation measurements, and site-related studies relevant to underground laboratories.

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WP3 covers modelling and simulation frameworks, background predictions, and machine learning approaches for monitoring and data quality improvements.

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WP4 explores quantum detector and enabling technologies relevant to low-mass dark matter searches and related instrumentation challenges. The main Objectives are:

• O4.1:Advance understanding of quantum foundations through R&I: Conduct cutting-edge research to explore fundamental issues in quantum mechanics, including wave function.
• O4.2: Develop and test quantum sensors for dark matter detection: Drive innovation by designing and deploying quantum superconducting circuits and low-background detectors to search for low-mass dark matter and evaluate their performance. These technologies will also serve as a platform for training early-career researchers (WP5).
• O4.3: Mitigate environmental noise in quantum technologies: Through collaborative R&I, identify and mitigate environmental noise sources that impact both quantum sensors and superconducting qubits, contributing to advancements in detector performance and quantum computing.
• O4.4: Promote training and knowledge transfer through secondments and reintegration: Facilitate secondments across partner institutions, offering interdisciplinary training opportunities in quantum science, experimental techniques, and data analysis. Reintegration plans will ensure knowledge transfer and application across all partners, including academic and non-academic sectors (WP5).

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WP5 organizes training, schools, and workshops, building capacity across the network and supporting knowledge transfer between partners.

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This aims to set and implement the management processes. The Management Board (MB), where all project partners are represented, will be created, representing the decision-making body for all questions related to the project’s strategy and operation. The main objectives are:

• O6.1 – Manage secondments and their accounting
• O6.2- Ensure that all knowledge is created and managed in a coordinated and coherent manner and that all activities, financial and legal aspects and other issues are managed to a high standard
• O6.3- All aspects of the EC requirements for reporting are met including controlling the achievement of project deliverables
• O6.4- Overall management/coordination of project activities (WP1-5), including risk management and definition of contingency planning

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