Recent years have witnessed a tremendous progress in the development of quantum technologies able to probe and harness quantum degrees of freedom in solid state systems. In this context, the CEA of Grenoble has recently pioneered the demonstration of a hybrid CMOS architecture where a single photon trapped in a superconducting resonator is strongly coupled to the spin of a single hole confined in a double quantum dot [1,2]. This experiment opens important perspectives for the development of novel hybrid circuit Quantum Electrodynamics architectures where the photons can probe, entangle and control the quantum state of distant spins.
The actual potential of such platforms for quantum technologies remains to be assessed from the theoretical side, in particular for applications to quantum computation and simulation. Differently from purely superconducting transmon or flux qubits, the mechanism underpinning strong spin-photon coupling relies on the presence of a significant spin orbit interaction in the valence bands of silicon.
This PhD thesis will reinforce the theoretical activity of the CEA on this topic and will investigate how to optimize readout and manipulation protocols for architectures based on silicon and germanium. Particular effort will be devoted to the quantitative modeling of spin-photon coupling and of the mechanisms limiting the performances of such devices (noise effects). We will also explore the many-body effects emerging when coupling several spins through single or multiple resonators.
 Strong coupling between a photon and a hole spin in silicon, Cécile X. Yu, Simon Zihlmann, José C. Abadillo-Uriel, Vincent P. Michal, Nils Rambal, Heimanu Niebojewski, Thomas Bedecarrats, Maud Vinet, Étienne Dumur, Michele Filippone, Benoit Bertrand, Silvano De Franceschi, Yann-Michel Niquet and Romain Maurand, Nature Nanotechnology 18, 741 (2023)
 Tunable hole spin-photon interaction based on g-matrix modulation, V. P. Michal, J. C. Abadillo-Uriel, S. Zihlmann, R. Maurand, Y.-M. Niquet, and M. Filippone, Phys. Rev. B 107, L041303 (2023)