© 2020

Fast Gates and Mixed-Species Entanglement with Trapped Ions


Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xvi
  2. Vera M. Schäfer
    Pages 1-7
  3. Vera M. Schäfer
    Pages 9-23
  4. Vera M. Schäfer
    Pages 25-63
  5. Vera M. Schäfer
    Pages 65-79
  6. Vera M. Schäfer
    Pages 81-101
  7. Vera M. Schäfer
    Pages 103-111
  8. Vera M. Schäfer
    Pages 113-132
  9. Vera M. Schäfer
    Pages 133-139
  10. Back Matter
    Pages 141-155

About this book


Quantum logic gates are the crucial information-processing operation of quantum computers. Two crucial performance metrics for logic gates are their precision and speed. Quantum processors based on trapped ions have always been the touchstone for gate precision, but have suffered from slow speed relative to other quantum logic platforms such as solid state systems. This thesis shows that it is possible to accelerate the logic "clock speed" from kHz to MHz speeds, whilst maintaining a precision of 99.8%. This is almost as high as the world record for conventional trapped-ion gates, but more than 20 times faster. It also demonstrates entanglement generation in a time (480ns) shorter than the natural timescale of the ions' motion in the trap, which starts to probe an interesting new regime of ion trap physics.

In separate experiments, some of the first "mixed-species" quantum logic gates are performed, both between two different elements, and between different isotopes. The mixed-isotope gate is used to make the first test of the quantum-mechanical Bell inequality between two different species of isolated atoms.


Quantum Computing Trapped Ions Fast Gates Mixed Species Gates Non-Adiabatic Entanglement Mixed Species Entanglement Geometric Phase Gate High-Fidelity Gate Quantum Processor speed

Authors and affiliations

  1. 1.Clarendon Laboratory, Department of PhysicsUniversity of OxfordOxfordUK

Bibliographic information