Quantum physics allows us to make computers whose computing power overcomes by large that of classical computers, whatever their future progress. This recent discovery has triggered a huge research effort for making quantum processors. Nowadays, the most advanced implementations are based on trapped ions and superconducting qubit circuits, and elementary instances of quantum algorithms were demonstrated with these systems and with some other ones. The Quantronics group at CEA-Paris-Saclay led by the applicant, Daniel Esteve, has played a key role in the development of superconducting qubits since its beginning. Despite the unsolved challenges raised by maintaining quantum coherence during processor evolution, and by the scalability issue, major players in information processing such as IBM, Microsoft, Intel or Google have developed since a few years in-house research and/or strong academic partnerships in order to mitigate the detrimental effect that a quantum breakthrough would have in their activities. Atos, a leading company in high performance computing, has similarly developed its own quantum computing activity. Since 2016, its teams develop quantum software and a powerful FPGA-based emulator of a quantum computer. Besides, Atos has initiated a collaboration with the Quantronics group of the applicant, and supports a first forthcoming CIFRE PhD thesis research for detecting a new type of quantum bit in the applicant laboratory. The work programme for this industrial chair first aims at providing to Atos the high level scientific watch in the field of quantum computing that the applicant and his team, who are well-recognized and well-connected to leading teams worldwide, can deliver. A second goal consists in providing to Atos physical models of different qubits embedding noise models, processing time, communication models in order to simulate them efficiently with the emulator Atos is presently developing. The goal is to enable Atos to get numerical metrics to be used for algorithm optimization in a given qubit platform. This analysis will be carried-out in-depth for all quantum bits developed by CEA. The main research objective is to develop new quantum bits with better quantum coherence than superconducting quantum bits. Given their limitations, there is no operational architecture for solving the quantum error correction issue in a superconducting processor when scaling the size. Indeed, the fault-tolerant architecture compatible with superconducting quantum bit error thresholds, namely the surface-code architecture, requires a prohibitive overhead in terms of physical qubit resources. In order to mitigate and solve these challenges, The applicant and his team propose to use nuclear spins as quantum bits, for which quantum error correction would be much less of a problem. When these nuclear spins are coupled to electronic spins by the hyperfine interaction, and these electronic spins are coupled to superconducting microwave resonators that transmit photons that can be measured, the combination of all these quantum systems provides an original attractive route towards a new quantum computing platform based on very coherent quantum bits. The potential route such a platform would have is of great interest for Atos, and applicant team has already obtained significant preliminary results in this direction. Last but not least, the collaboration between Atos and CEA in the field of quantum computing would even more connect Atos with the microfabrication capacity of CEA if an industrial development is foreseen.