Measurements have been made of entangled top quarks at the ATLAS experiment
Particle colliders behave as quantum instruments, and as such can be used to test foundational concepts in quantum information theory, such as entanglement and Bell inequality violation.
Our measurements are sensitive to quantum phenomena such as quantum state tomography, entanglement, and Bell violation in deeply subatomic regions where they are just starting to be probed. The project team also investigates the philosophical implications of these measurements in the context of the principles of locality, reality and objectivity, and of fundamental particles and indistinguishability.
Our papers have shown that foundational quantum measurements can be made in systems including decays of Higgs bosons to ZZ or to WW, in top quark production, and also in states containing gluons.
DPhil and postdoc positions are available to start October 2025 in this area.
Some of our recent publications can be found here.
New Scientist magazine wrote a cover-page article on our research here.
Contact: Alan Barr
Supported by the John Templeton Foundation