Funded by the European Innovation Council (EIC) under Horizon Europe, QOSiLICIOUS is a groundbreaking initiative dedicated to revolutionizing Quantum Key Distribution (QKD) by transitioning away from expensive, traditional III-V semiconductor technologies. The project focuses on developing miniaturized, highly scalable, and cost-efficient all-silicon quantum-optic solutions. By prioritizing energy efficiency and sustainability, QOSiLICIOUS aims to pave the way for mass-market adoption and ensure the seamless integration of quantum security into existing ICT infrastructures. To achieve this ambitious goal, the initiative is actively developing silicon-integrated quantum light emitters, quantum random number generator (QRNG) pixels, and QKD transmitters, alongside advanced GeSi-based single-photon detectors. Ultimately, QOSiLICIOUS intends to demonstrate the practical, cost-effective deployment of these next-generation QKD systems across critical, high-demand use cases, including intra-datacenter communications, 6G networks, and Internet of Things (IoT) applications. 

ORQESTRA is an initiative designed to deliver practical, formally verified, and highly efficient implementations of Post-Quantum Cryptography (PQC). The project addresses the critical need to bridge the gap between the computationally intensive nature of PQC algorithms and the operational deployment of certifiable, quantum-resistant security systems. To achieve this, ORQESTRA will develop a cost-effective suite of programmable software optimizations and shared hardware accelerators. By introducing novel concepts tailored specifically for the defense domain, the project establishes a new security paradigm for fully functional, quantum-safe communication networks capable of operating over long distances and legacy infrastructures. To validate its technological benefits and overall effectiveness, ORQESTRA will implement eight distinct military usage scenarios encompassing a variety of realistic, mixed-criticality applications across heterogeneous devices. These use cases span diverse operational domains, focusing on deploying quantum-safe compliance to safeguard terrestrial land operations, enabling secure post-quantum maritime critical infrastructures, and future-proofing next-generation aerial communications. 

TransEuroOGS will provide a quantum-secure space-to-ground network interface for satellite-based communication with a total of eight interoperable optical ground stations (OGS) in Germany, Greece, Ireland and Luxembourg. As part of Europe’s EuroQCI initiative, an EU-wide quantum communications infrastructure programme, the TransEuroOGS project addresses challenges to secure transnational communication in the EU by utilizing the unique security principles of quantum technologies, especially in quantum key distribution (QKD). Furthermore, the project aims to contribute to a unified European standard for interoperability among the optical ground stations participating in EuroQCI and thus strengthens the technological sovereignty of Europe and its Member States.

SEEWQCI aims to develop a resilient quantum network to ensure the secure transmission of sensitive data between government agencies, research institutions, and critical infrastructure, expand and interconnect the existing NatQICs with partner networks to create a miniature model of EuroQCI, integrate satellite quantum communications using Optical Ground Stations (OGS) and the EAGLE-1 satellite to enhance pan-European quantum connectivity and strengthen cooperation between participating countries while ensuring full interoperability with European initiatives.

SEEWQCI combines terrestrial (optical fiber) and satellite (Quantum Key Distribution, QKD) connections to provide secure data transmission, placing Greece and South-East to Western Europe at the forefront of quantum communications, strengthening cybersecurity and Europe’s strategic autonomy and enhancing security and interoperability within EuroQCI.

LaiQa comes as a technology intensive research and innovation action aiming to develop and advance critical components and technologies necessary to build a global spaced-based quantum network. LaiQa envisions to realize unconditionally secure quantum communications over long distances bringing functional QKD components together with advanced system integration techniques towards deployable space-QKD systems. The project’s objectives will include the development of space-deployable, high-brightness 1550 nm entangled photon pair source (EPPS), a space-suitable Decoy State – BB84 Prepare and Measure (P&M) source, a photonic integrated EPPS for next-generation on-board sender stations, a quantum memory for long-distance entanglement distribution, an advanced fiber-coupling/adaptive optics system for converged space/terrestrial QKD segments, and software components towards the optimization of LaiQa architecture. The project will demonstrate P&M- and entanglement based QKD systems both in lab/terrestrial FSO testbeds and in field demonstrations in Helmos optical ground station (OGS). LaiQa will also mobilize its consortium to prioritize standardization activities that focus on space components for P&M- and entanglement-QKD, consider interfaces and parameters for them to propose specification standards and potentially trigger new standardization activities within EU.

HellasQCI project aims to deploy advanced National QCI systems and networks. Its architecture comprises of three metropolitan testsites located at major cities of Greece namely: ΗellasQCI-Central (Athens), HellasQCI-North (Thessaloniki) and HellasQCI-South (Heraklion-Crete). Each test-site is divided into Governmental and Industrial testbeds, which allow the project to investigate the fielddeployment of QKD technologies in a plethora of realistic scenarios and use cases addressing National Security, Public Health, Critical Infrastructure and ICT sector. An additional Educational testbed will allow the development of new quantum technologies, provide a sandpit for SME innovation, and offer Greece a futureproof extension towards Quantum Internet. It will also serve as a comprehensive training environment for technical, research staff and end users. For inter-test-site links and international connection with other EuroQCI members, HellasQCI will exploit three Greek observatories, which constitute a national asset and have been selected by ESA to be upgraded as Optical Ground Stations with QKD capabilities. The aim of HellasQCI is also to create a community from all interested national stakeholders, gather expertise and share knowhow on the application of quantum technologies. The HellasQCI consortium involves key research institutes and universities of Greece, which are able to address the needs for an operational HellasQCI infrastructure. Governmental authorities that participate in the project, including the Ministry of Digital Governance, the Ministry of Defense, the Police, the Army and the National Intelligence Agency together with industrial partners, and SMEs can ensure the sustainability of HellasQCI. HellasQCI plans to cooperate with other EU Member States in order to boost Europe's scientific and technological capabilities in cybersecurity and quantum technologies, and to this end, it has already made partnerships with AT, LU, IE, ML, BG, PL, CY.

The Quantum Secure Networks Partnership (QSNP) project aims at creating a sustainable European ecosystem in quantum cryptography and communication. A majority of its partners, which include world-leading academic groups, research and technology organizations (RTOs), quantum component and system spin-offs, cybersecurity providers, integrators, and telecommunication operators, were members of the European Quantum Flagship projects CIVIQ, UNIQORN and QRANGE. QSNP thus gathers the know-how and expertise from all technology development phases, ranging from innovative designs to development of prototypes for field trials. QSNP is structured around three main Science and Technology (ST) pillars. The first two pillars, “Next Generation Protocols” and “Integration”, focus on frontier research and innovation, led mostly by academic partners and RTOs. The third ST pillar “Use cases and Applications” aims at expanding the industrial and economic impact of QSN technologies and is mostly driven by companies. In order to achieve the specific objectives within each pillar and ensure that know-how transfer and synergy between them are coherent and effective, QSNP has established ST activities corresponding to the three main layers of the technology value chain, “Components and Systems”, “Networks” and “Cryptography and Security”. This framework will allow achieving the ultimate objective of developing quantum communication technology for critical European infrastructures, such as EuroQCI, as well as for the private information and communication technology (ICT) sectors. QSNP will contribute to the European sovereignty in quantum technology for cybersecurity. Additionally, it will generate significant economic benefits to the whole society, including training new generations of scientists and engineers, as well as creating high-tech jobs in the rapidly growing quantum industry.

QRONOS, hosted by the National and Kapodistrian University of Athens, is an HFRI project that focuses on advancing secure quantum communication and quantum networking. It aims to innovate in three key areas: Dynamic Quantum Key Distribution (QKD), coexistence of quantum and classical signals over novel hollow core fibers, and end-to-end entanglement distribution networks. Leveraging cutting-edge technologies, including continuous variable QKD and twin-field QKD, QRONOS seeks to address current challenges in scalability, power budgets, and network flexibility. By developing dynamic configurations for quantum links and employing machine learning algorithms for optimal resource allocation, the project promises to enhance secure data transmission and distributed quantum computing capabilities. With its emphasis on pioneering research, collaboration, and practical implementation, QRONOS is set to contribute significantly to the future of the quantum internet and secure communication infrastructure.