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Theses

Cavity quantum electrodynamics with a single spin : coherent spin-photon coupling and ultra-sensitive detector for condensed matter

Abstract : This thesis work is centered around two key aspects of quantum technologies: quantum information processing and quantum sensing. It builds up onto the microwave light toolbox, developed in circuit quantum electrodynamics, to investigate the properties of mesosocopic circuits. Those circuits, made out here of carbon nanotubes, can be designed to act as quantum bits of information or as condensed matter model system and this thesis explore both aspects. The realization of a coherent spin-photon interface illustrates the first one. The experiment relies on ferromagnetic contacts to engineer an artificial spin-orbit coupling in a double quantum dot. This coupling hybridizes the spin and the charge degree of freedom of the electron in this circuit. By embedding this circuit into a microwave cavity, whose electrical field can be coupled to the charge, we realize an artificial spin-photon interface. A second project, started during this thesis, focuses on using quantum dot circuits as model systems. This project consists in coupling, via a microwave cavity, a superconducting qubit, that will serve as a delicate probe, and single quantum dot circuit. Such a circuit can display several behaviors including the Kondo effect which is intrinsically a many-body effect. In this work, we present both a theoretical study of some possible outcomes of this experiment, and experimental developments. Finally, a theoretical proposition to detect the self-adjoint character of Majorana fermions using a microwave cavity, is presented.
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Matthieu Dartiailh. Cavity quantum electrodynamics with a single spin : coherent spin-photon coupling and ultra-sensitive detector for condensed matter. Condensed Matter [cond-mat]. Université Paris sciences et lettres, 2017. English. ⟨NNT : 2017PSLEE035⟩. ⟨tel-01807664⟩

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