Welcome to the homepage of SPANGL4Q, an EU Future and Emerging Technologies project. This project ended in August 2015, but this website is being maintained to provide information and links to publications arising from the project.
If you're not an expert, you might want to start here, which contains an introduction to quantum computing by project coordinator Dr. Ruth Oulton, as well as a downloadable poster.
Spin Photon Angular Momentum Transfer for Quantum Enabled Technologies (SPANGL4Q)
This EU FP7 funded FET-Open project, SPANGL4Q, ran from March 2013 - August 2015.
Our aim was to create a range of novel devices and fundamental understanding. To achieve this, the project sought to address the following key problems in quantum information science:
- What is the best form for a hybrid spin-photon quantum memory?
- How does one transfer quanta of angular momentum from it to a single photon?
- How will this angular momentum be encoded?
In this project we investigated the potential for semiconductor quantum dot (QD) spins to act as an efficient, long-lifetime quantum memory. Three key aspects were important to achieve this:
- Firstly, the intricate physics of how photonic structures show localised polarization effects that affect how QD spins couple to them was investigated, with several very novel and surprising results.
- Secondly, the type of spin to be used was investigated: we studied both fast-access electron spins with a microsecond memory lifetime, and millisecond to second-long lifetime memories in the form of nuclear spins.
- Finally, efficiency of input and output of the photon was considered, and resulted in the establishment of efficient and high-speed designs that allow us to be sure that the photon-spin interaction is guaranteed and not probabilistic, paving the way for scalable quantum photonic networks.
Want some simple facts about quantum computers? Then visit this Q&A article in the Guardian (UK), where the Coordinator, Ruth Oulton, was interviewed in March 2014.