Simon Schmidt

Dr. Simon Schmidt Postdoctoral Researcher

E-Mail: s.schmidt@rub.de Office: MC 1.87

Research Interests

I am interested in quantum information theory, quantum cryptography and quantum groups. More precisely, I work on self-testing and its applications in quantum cryptography. Furthermore, I work on the isomorphism game and quantum automorphism groups of finite graphs.

Publications and preprints

• Compiled Nonlocal Games from any Trapdoor Claw-Free Function
  Kaniuar Bacho, Alexander Kulpe, Giulio Malavolta, S. Schmidt, Michael Walter
  ePrint:2024/1829, accepted at CRYPTO’25
• A bound on the quantum value of all compiled nonlocal games
  Alexander Kulpe, Giulio Malavolta, Connor Paddock, S. Schmidt, Michael Walter
  arXiv:2408.06711, QIP’25 (short plenary talk) and accepted at STOC’25
• A Computational Tsirelson’s Theorem for the Value of Compiled XOR Games
  David Cui, Giulio Malavolta, Arthur Mehta, Anand Natarajan, Connor Paddock, S. Schmidt, Michael Walter, Tina Zhang
  arXiv:2402.17301, TQC’24
• Asymmetric graphs with quantum symmetry
  Josse van Dobben de Bruyn, David E. Roberson, S. Schmidt
  arXiv:2311.04889
• Quantum automorphism groups of trees
  Josse van Dobben de Bruyn, Prem Nigam Kar, David E. Roberson, S. Schmidt, Peter Zeman
  Journal of Noncommutative Geometry (2025)
• A mathematical foundation for self-testing: Lifting common assumptions
  Pedro Baptista, Ranyiliu Chen, Jędrzej Kaniewski, David Rasmussen Lolck, Laura Mančinska, Thor Gabelgaard Nielsen, S. Schmidt
  arXiv:2310.12662, QIP’24
• Quantum isomorphic strongly regular graphs from the E8 root system
  S. Schmidt
  Algebraic Combinatorics, Volume 7 (2024) no. 2, pp. 515-528
• Polytope compatibility – from quantum measurements to magic squares
  Andreas Bluhm, Ion Nechita, S. Schmidt
  Journal of Mathematical Physics 64, 122201 (2023)
• Counterexamples in self-testing
  Laura Mančinska, S. Schmidt
  Quantum 7, 1051 (2023), TQC’23
• Solution group representations as quantum symmetries of graphs
  David Roberson, S. Schmidt
  Journal of the London Mathematical Society (2022)
• Existence of Quantum Symmetries for Graphs on Up to Seven Vertices: A Computer based Approach
  Viktor Levandovskyy, Christian Eder, Andreas Steenpass, S. Schmidt, Julien Schanz, Moritz Weber
  ISSAC ‘22: Proceedings of the 2022 International Symposium on Symbolic and Algebraic Computation
• Sinkhorn algorithm for quantum permutation groups
  Ion Nechita, S. Schmidt, Moritz Weber
  Experimental Mathematics (2021)
• Quantum symmetry vs nonlocal symmetry
  David Roberson, S. Schmidt
  arXiv:2012.13328
• Almost all trees have quantum symmetry
  Luca Junk, S. Schmidt, Moritz Weber
  Archiv der Mathematik (2020)
• Quantum automorphisms of folded cube graphs
  S. Schmidt
  Annales de l’Institut Fourier (2020)
• On the quantum symmetry of distance-transitive graphs
  S. Schmidt
  Advances in Mathematics (2020)
• Quantum symmetries of graph C*-algebras
  S. Schmidt, Moritz Weber
  Canadian Mathematical Bulletin (2018)
• The Petersen graph has no quantum symmetry
  S. Schmidt
  Bulletin of the London Mathematical Society (2018)

Awards

• Marie Skłodowska-Curie Individual Fellowship, project Nonlocality in quantum groups
• Dr. Eduard Martin-Preis

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