In recent years, a fundamentally different form of information processing has emerged that exploits quantum mechanics. Once realized, quantum computers can efficiently solve classes of problems that would take the lifetime of the universe to solve on conventional supercomputers. Developing quantum hardware with sufficiently low noise, and quantum computing architectures tailored to use it, remain central challenges that currently prevent reaching quantum computers at scale, as required for known useful applications. Photonic quantum computing has a comparative advantage over other approaches because it can scale up to large-scale quantum computing by leveraging pre-existing (classical) semi-conductor photonics technology. The main challenge is to realize core building blocks of sufficiently high quality and to devise resource-efficient quantum architectures. Over the past decades, Danish researchers have developed unique photonic quantum hardware based on deterministic photon-emitter interfaces. In FTQP, we will advance these foundational hardware building blocks and propose fault-tolerant quantum computing architectures tailored to them. The co-design of quantum hardware and computing architecture is considered a highly fruitful approach in order to achieve real progress. The proposed project constitutes a new and highly promising approach to scalable quantum computing that fully exploits a true strong-hold position of Danish researchers.