Thesis

Towards cryogenic dual-species tweezer arrays

Downloadable Content

Download PDF
Creator
Rights statement
Awarding institution
  • University of Strathclyde
Date of award
  • 2026
Thesis identifier
  • T18130
Person Identifier (Local)
  • 202256555
Qualification Level
Qualification Name
Department, School or Faculty
Abstract
  • This thesis presents work towards a dual-species array of neutral Rb and Cs atoms built within a cryogenic apparatus for quantum computing. The project aims to demonstrate non-destructive readout through the naturally non-resonant imaging wavelengths of Rb and Cs atoms and to show improved trap lifetimes by using cryogenics for improved vacuum. This thesis presents analysis of interactions between Rb and Cs Rydberg dorbitals where F¨orster resonant d-states are identified as candidates for high fidelity qubit operations. We model CkZ gates up to k = 4 and demonstrate competitive qubit fidelities with d-orbitals, with further enhancements attainable through improved gate protocols. We then move on to discuss the design of a next generation experiment for realising dual-species arrays in a cryogenic environment. This new experiment utilises a He cryostat to reach a base temperature of ∼7 K to take advantage of cryopumping to lower the vacuum pressure for increased trap lifetimes. In-vacuum aspheric lenses allows for the projection of independent tweezer arrays for trapping single Rb and Cs atoms. This thesis then discusses loading of a cryogenic Cs MOT before loading single Cs atoms in holographic optical dipole traps. Several enhancements in vacuum are used to demonstrate increased trap lifetimes from ∼10 s up to ∼1 minute where further enhancements will be attainable with active in trap cooling. Increased trap lifetime is vital for the realisation of quantum computing at scale.
Advisor / supervisor
  • Pritchard, Jonathan D.
Resource Type
DOI

Relations

Items

Thumbnail Title Date Uploaded Visibility Actions
file details PDF of thesis T18130 2026-09-23 Public Download