The security of most digital infrastructures relies on public key cryptography (PKC), which enables secure communications between entities without sharing any pre-established secret. The robustness of current PKC techniques is based on the computation complexity of two mathematical problems: the factorization of large numbers and the computation of discrete logarithms, which cannot be solved by current computing systems in a reasonable amount of time. However, quantum computing will be able to solve these problems and hence make vulnerable any digital system based on PKC. Therefore, current cryptographic primitives need to be replaced by an upgraded quantum-resistant cryptography, known as Post-Quantum Cryptography (PQC). Providing such PQC requires a multidisciplinary approach combining the expertise of different research teams working in different areas. This proposal aims to establish a consortium able to identify solutions and potential limitations in the development of microelectronic and nanophotonic technologies for secure digital systems in the postquantum world. To achieve this goal, the TECHNOQUANTUM project will create an international network of expert research teams specialized in system and communications security, software and hardware engineering, and electronic and photonic design. Through a series of seminars, short stays, and meetings, the participants will exchange ideas and validate hypothesis, consolidating already-established collaborations and creating new ones. This will result in a strategic plan to design research projects together and participate in international competitive calls, with the aim of building resilient digitized cities, communities and services (in line with the Sustainable Development Goals, SDGs) to drive societal and economic growth.