Measurements of fast dynamics of hole spins in silicon
type: CreativeWork
description: The development of quantum computing promises to revolutionise the technology of the 21st century. Single spins trapped in silicon quantum dots (QDs) have become an increasingly promising hardware platform for quantum computing due to their long coherence times, high-fidelity control and industry compatibility for scaling purposes. In particular, the use of hole spin system, displaying strong spin-orbit interactions (SOI), has enabled fast electrical control, however, requires a richer understanding of the physics of interacting spins in the presence of SOI both for control as well as readout of the spin states. In this thesis, I explore the spin dynamics of holes in silicon utilizing fast microwave readout circuitry. High-fidelity readout, a requirement for fault-tolerant quantum computing, requires long measurement times when compared to typical operation times, creating a bottleneck in the operational speed of quantum computers. To address this challenge, I develop a series of multi-module superconducting resonators that enable charge readout at the state-of-the-art while allowing for multiplexing the readout of many QDs, by sensitively detecting the capacitance changes associated with single charge movements between QDs and reservoirs. This result, in conjunction with spin-to-charge conversion methods, should reduce the time needed for spin readout in scaled up architectures. Next, I explore spin-to-charge conversion in the presence of SOI. The presence of SOI can lead to spin projection errors under standard readout methodologies, limiting the maximum achievable fidelity. To overcome this challenge, I develop a new protocol based on in-situ dispersive readout techniques making use of the energy detuning dependence of the charge polarizability of a hybrid DQD system to achieve spin-selective readout. I use this readout method to measure spin dynamics of holes shared between QDs and single boron atoms. Further, I explore the resonant interaction between the hybri…
abstract: The development of quantum computing promises to revolutionise the technology of the 21st century. Single spins trapped in silicon quantum dots (QDs) have become an increasingly promising hardware platform for quantum computing due to their long coherence times, high-fidelity control and industry compatibility for scaling purposes. In particular, the use of hole spin system, displaying strong spin-orbit interactions (SOI), has enabled fast electrical control, however, requires a richer understanding of the physics of interacting spins in the presence of SOI both for control as well as readout of the spin states. In this thesis, I explore the spin dynamics of holes in silicon utilizing fast microwave readout circuitry. High-fidelity readout, a requirement for fault-tolerant quantum computing, requires long measurement times when compared to typical operation times, creating a bottleneck in the operational speed of quantum computers. To address this challenge, I develop a series of multi-module superconducting resonators that enable charge readout at the state-of-the-art while allowing for multiplexing the readout of many QDs, by sensitively detecting the capacitance changes associated with single charge movements between QDs and reservoirs. This result, in conjunction with spin-to-charge conversion methods, should reduce the time needed for spin readout in scaled up architectures. Next, I explore spin-to-charge conversion in the presence of SOI. The presence of SOI can lead to spin projection errors under standard readout methodologies, limiting the maximum achievable fidelity. To overcome this challenge, I develop a new protocol based on in-situ dispersive readout techniques making use of the energy detuning dependence of the charge polarizability of a hybrid DQD system to achieve spin-selective readout. I use this readout method to measure spin dynamics of holes shared between QDs and single boron atoms. Further, I explore the resonant interaction between the hybri…
author: Ritter Von Horstig, Felix-Ekkehard
language: eng
keywords: Quantum computing, Quantum dots, Hole spin, Spin-orbit coupling, Radiofrequency reflectometry, Superconducting resonators, Floquet theory
license: https://apollo8-f-pro.lib.cam.ac.uk/bitstreams/b92e17c9-3574-4c5a-83e0-8210f241205c/download
license: https://www.rioxx.net/licenses/all-rights-reserved/
date published: 2024-05-01
date modified: 2026-07-22T22:24:06Z
provider: Cambridge University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Cambridge

PropertyValue
property ID: DOI
value: 10.17863/CAM.111576