Resonantly excited quantum dots in micropillars: an efficient source of indistinguishable single photons interfaced with fibre

Jordan, Matthew 2024. Resonantly excited quantum dots in micropillars: an efficient source of indistinguishable single photons interfaced with fibre. PhD Thesis, Cardiff University. Item availability restricted.

Preview	PDF (Thesis) - Accepted Post-Print Version Download (10MB) | Preview
	PDF (Cardiff University Electronic Publication Form) - Other Restricted to Repository staff only Download (138kB)

Abstract

The research presented in this thesis examines a popular solid state solution for the generation of indistinguishable single photons for quantum computing: self-assembled quantum dots embedded in semiconductor pillar microcavities. Coupling to the cavity modes of these structures increases the spontaneous emission rate of the dots via Purcell enhancement, while also directing the output light in such a way to be efficiently collected into an optical fibre. This makes them a strong choice of source for photonics-based quantum applications, including computation, metrology, and secure communications. Two designs of micropillar, configured for a low- or high-quality factor, are studied both computationally, using finite-difference time-domain (FDTD) methods, and experimentally. The high-aspect ratio pillars used in lab work were produced using a novel direct-write lithography-based fabrication process capable of deep sidewall etches with smoothness (53 ± 10) pm, matching the state of the art, as determined using photoluminescence and reflectivity based spectroscopic characterisation.

Item Type:	Thesis (PhD)
Date Type:	Completion
Status:	Unpublished
Schools:	Schools > Engineering
Uncontrolled Keywords:	quantum dot; micropillar; non-cavity modes; Purcell factor; Microcavity; direct-write lithography
Date of First Compliant Deposit:	22 May 2025
Last Modified:	22 May 2025 15:31
URI:	https://orca.cardiff.ac.uk/id/eprint/178405

Actions (repository staff only)

Edit Item