Leon Deryck Loveridge

Leon Deryck Loveridge

Associate Professor

Faculty of Technology, Natural Sciences and Maritime Sciences
Department of Science and Industry systems
Campus Kongsberg ()
I am a mathematical physicist, specialising in the foundations of quantum mechanics, quantum information and quantum field theory. My main interest is in understanding the relationship between the quantum mechanical formalism and the world it is used to describe.



I am a member of the Quantum Technology Research Group. My research centers on the application of precise mathematics to conceptual problems in the foundations of quantum mechanics, and also to more applicable questions related to quantum metrology and computation. More specifically, my interests can be outlined as follows:

  • Symmetry in Quantum Measurements: Wigner-Araki-Yanase theorem, superselection rules, quantum frames of reference, timeless formulations.
  • Quantum Contextuality: Kochen-Specker theorems, contextuality in quantum computation, topos quantum theory, sheaf-theoretic approaches, connections to incompatibility.
  • Other: Quantum-classical contrast, relational quantum mechanics, quantum metrology, quantisation and classical limit, quantum logic, operator algebras.


I currently teach the following courses at USN:

  • Physics II
  • Linear Algebra
  • Special Relativity and Astrophysics

Previous courses include:

  • Quantum Mechanics II
  • Mathematics for the Sciences
  • Special Relativity
  • Applications of Non-linear Dynamics



  • 2019-Present: Associate Professor, University of South-Eastern Norway
  • 2017-2019: Lecturer, University of York
  • 2016-2017: Visiting Research Fellow, Utrecht University
  • 2015-2016: Research Assistant, Oxford University
  • 2012-2014: Postdoctoral Research Fellow, University of British Columbia


  • 2008-2012: PhD, Mathematics, University of York
  • 2004-2008: MSci, Physics with Theoretical Physics, Imperial College London


Selected Publications

  • Relative Quantum Time 

Leon Loveridge, Takayuki Miyadera, Foundations of Physics 49, 6 (2019)

  • Symmetry, Reference Frames, and Relational Quantities in Quantum Mechanics

Leon Loveridge, Paul Busch, Takayuki Miyadera, Foundations of Physics 48, 2 (2018)

  • Approximating relational observables by absolute quantities: a quantum accuracy-size trade-off   

Takayuki Miyadera, Leon Loveridge, Paul Busch, J. Phys. A: Math. Theor. 49 (2016)

  • Topos Logic in Measurement-based Quantum Computation

Leon Loveridge, Raouf Dridi, Robert Raussendorf, Proc. Roy. Soc. A 471 (2015)

  • Position Measurements Obeying Momentum Conservation

Paul Busch, Leon Loveridge, Phys. Rev. Lett. 106 (2011)