Nonlinear Light-Atom Interactions in Hollow-Core Fibre for Quantum Information Processing

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dc.contributor.advisorSparkes, Benjamin
dc.contributor.advisorPerrella, Chris
dc.contributor.advisorLuiten, Andre
dc.contributor.authorRowland, Jed Anthony
dc.contributor.schoolSchool of Physics, Chemistry and Earth Sciences
dc.date.issued2025
dc.description.abstractQuantum information networks will facilitate the use of a broad range of quantum technologies including quantum computers, quantum sensors, and quantum communication systems, among others. An important component of these networks are devices that enable light-atom interactions, as they interface photons from communication channels with the matter-based nodes, allowing for processing of photonic quantum information. These devices will need to be scalable and easily integrated to expand the size of networks. One platform of interest is vapour-filled hollow-core fibres (HCF). By overlapping light and atomic vapour within the same volume, strong interactions can occur, including important nonlinear effects such as cross-phase modulation and wave mixing processes. HCFs can be directly integrated into fibre systems, making them a convenient technology for the expansion of quantum networks. This thesis reports on three projects themed around scalable technologies for quantum networks. The first project involved the injection-locking of a diode laser. Nanosecond long pulses had their 20 GHz frequency chirps reduced to near the Fourier-transform limit, enabling them to interact efficiently with rubidium vapour. This project demonstrated that the mature, cost effective, and scalable technology of diode lasers can be compatible with essential atomic ensemble quantum networking devices such as quantum memories and quantum frequency converters. In the second project, a high-bandwidth quantum memory protocol called off-resonant cascaded absorption (ORCA) was investigated. The ORCA memory can be used to synchronise high speed photonic operations that occur in optical quantum information processing. This project used a Kagom´e HCF to enhance the light-atom interactions, resulting in two orders of magnitude reduction in optical power requirements. The third project again used the HCF platform, this time to facilitate a quantum frequency conversion scheme that converts rubidium-compatible, near-IR wavelengths to the telecommunications C-band, which is ideal for long distance fibre transmission. This project demonstrated the FWM process has reduced optical pump powers and higher efficiency in the HCF when compared to a rubidium-filled cell. The research described in this thesis presents a strong argument for the use of HCFs as a scalable technology that could be implemented in quantum networks.
dc.description.dissertationThesis (Ph.D.) -- University of Adelaide, School of Physics, Chemistry and Earth Sciences, 2025en
dc.identifier.urihttps://hdl.handle.net/2440/146169
dc.language.isoen
dc.provenanceThis 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/legalsen
dc.subjectNonlinear optics
dc.subjecthollow-core fibre
dc.subjectquantum memory
dc.subjectquantum frequency conversion
dc.titleNonlinear Light-Atom Interactions in Hollow-Core Fibre for Quantum Information Processing
dc.typeThesisen

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