We theoretically propose a scheme for a spin quantum bit based on a double quantum dot contacted to ferromagnetic elements . Interface exchange effects enable an all electric manipulation of the spin and a switchable strong coupling to a superconducting coplanar waveguide cavity. This allows to envision on‐chip single spin manipulation and read‐out using cavity QED techniques. Our setup does not rely on any specific band structure and can in principle be realized with many different types of nanoconductors. We discuss in particular the case of an implementation with carbon nanotubes.  A. Cottet and T. Kontos, arXiv:1005.190
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