Giovani Crasby BRITTON OROZCO

Abstract: Quantum computing is a very active branch of R&D activity which shows encouraging results in terms of both physical integration and algorithmic solutions. In particular, silicon spin qubits as well as transmon qubits are candidates already available in laboratories and their measurements confirm what is expected. Moreover, in the processing chain under cryogenic conditions, the measurement of the quantum state and its control are critical points. Conventionally, there is a low noise amplifier (LNA) and a signal generator centered on the read / control frequency of the qubit considered. Thus, the central difficulty is to be able to have an LNA operating at low noise cryogenic temperature without the latter disturbing the integrated system and this in a technology compatible with the specifications. This is the central subject of this thesis. This LNA device associated with measurement / control electronics, all in the cryogenic stage, will go beyond the state of the art in the field of quantum feedback.