Abstract :
Circuit quantum electrodynamics is a currently very active field of research. Since the discoveries that an artificial spin, the so-called qubit, can be implemented using a superconducting non-linear circuit and can coherently interact with the electromagnetic field at the single-photon level, it has gathered strong interest for its potential for quantum computing but also for its ability to create, manipulate and detect microwave states with an exquisite precision. This manuscript describes three experiments harnessing and building on the tools and concepts developed for circuit quantum electrodynamics to couple microwave fields to other fundamental entities, namely phonons and electron spins. In a first experiment, we show the coherent coupling of superconducting to surface acoustic wave phonons. It demonstrates that acoustic waves can be used to carry quantum information and distribute entanglement. We then explore the coupling of superconducting circuits to electronic spins, and its potential for sensing and quantum information storage. The second experiment concentrates at building a high-sensitivity spectrometer able to detect spins in picoliter sized samples, targeting samples from chemical or biological origins. The third experiment is about implementing a quantum memory using a spin ensemble possessing second-long coherence. We namely explore the potential of circuit-enhanced radiation cooling to polarize the spin ensemble and enhance the efficiency of the quantum memory storage.
Defense in front of a jury composed by :
- Monsieur Olivier BUISSON
- Monsieur Pascal DEGIOVANNI
- Madame Yiwen CHU
- Monsieur Olivier ARCIZET
- Madame Natalia ARES
- Monsieur Benjamin HUARD
Gratuit
Disciplines