Quantum information processing with geometric phases, cavity magnonics, and semiconductor nanostructures

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.

Author dc:creator

• Gardin, Alan Greg

Advisors dc:contributor.advisor

• Tettamanzi, Giuseppe
• Fumeaux, Christophe (The University of Queensland)
• Person, Christian (IMT Atlantique)
• Castel, Vincent (IMT Atlantique)

• Quantum information processing with geometric phases
• cavity magnonics
• and semiconductor nanostructures

Language dc:language.iso

en

Handle dc:identifier.uri

https://hdl.handle.net/2440/145349

OAI identifier oai:identifier

oai:digital.library.adelaide.edu.au:2440/145349