2026-09-22T05:03:17Zhttps://digital.library.adelaide.edu.au/server/oai/request

oai:digital.library.adelaide.edu.au:2440/1453492025-06-23T05:45:45Zcom_2440_14759col_2440_14760

Tettamanzi, Giuseppe Fumeaux, Christophe (The University of Queensland) Person, Christian (IMT Atlantique) Castel, Vincent (IMT Atlantique) Gardin, Alan Greg School of Physics, Chemistry and Earth Sciences 2024 https://hdl.handle.net/2440/145349 Joint cotutelle PhD program between the School of Physics, Chemistry and Earth Sciences, University of Adelaide and the SPIN Doctoral School (specialty telecomunications), IMT-Atlantique The broad objective of this thesis is to contribute to the practical realisation of quantum information processing, and more generally quantum technologies. Therefore, we first identify various physical resources and behaviours of interest. Among these, we focus in this thesis on coherent control (the ability to manipulate quantum information), quantum information transduction (the conversion of quantum information), non-reciprocal behaviours, and the creation of non-classical states. Concerning coherent control, we examine the use of semiconductor-based nanostructures, notably electrostatically defined quantum dots in silicon-germanium heterostructures for quantum computing. By considering such a structure in the presence of a slightly tilted silicongermanium interface, we theoretically demonstrate the control of a quantum bit based on the valley degrees of freedom, originating from the degenerate conduction band minima of silicon. We also study the ultrastrong coupling of light and matter, which can occur in various physical systems such as cavity magnonics and semiconductor nanostructures. Notably, the ultrastrong coupling regime allows for faster quantum information transduction and the creation of non-classical states. Cavity magnonics is shown to be a versatile platform with applications in quantum information transduction, the creation of non-classical states, and the engineering of non-reciprocal effects. Concerning the latter, we show that it can be created using synthetic gauge fields, themselves induced by combining various Zeeman interactions by a process reminiscent of geometric phases. Thesis (Ph.D.) -- University of Adelaide, School of Physics, Chemistry and Earth Sciences en Quantum information processing with geometric phases cavity magnonics and semiconductor nanostructures Quantum information processing with geometric phases, cavity magnonics, and semiconductor nanostructures Thesis This electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exceptions. If you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at: http://www.adelaide.edu.au/legalsopen.access