The PhD candidate will develop QKD hardware for satellite-based QKD, in collaboration with researchers from Toshiba Europe Limited and Heriot Watt University. Particular attention will be given to the development of optimized devices for quantum random number generation and free-space quantum key distribution transmission. The candidate will implement innovative schemes for information encoding at different wavelengths, assemble devices using discrete optics and participate to the development of the control electronics. The optics to decode the encoded pulses may also be developed in the scope of the PhD project.