Nando Leijenhorst

Institut für Mathematik

Alpen-Adria-Universität Klagenfurt

Univeristätsstr. 65-67

9020 Klagenfurt am Wörthersee

Austria

From September 2026, I am a Postdoc at the Mathematics department at the Alpen-Adria-Universität Klagenfurt, Austria, in the group of Angelika Wiegele. Before, I was a Postdoc in the Polynomial Optimization group at LAAS-CNRS in Toulouse, France, with Victor Magron and Igor Klep. In October 2025, I obtained my PhD in the Discrete Mathematics and Optimization group at Delft University of Technology in Delft, the Netherlands, under supervision of David de Laat.

Currently I am mostly interested in applying semidefinite programming and polynomial optimization techniques in various areas, ranging from discrete geometry (e.g., the kissing number problem and energy minimization on the sphere) to quantum information theory (e.g. the NPA hierarchy).

selected publications

Preprint

Quantitative semidefinite certificates for ground-state energies of Pauli Hamiltonians

Igor Klep, Nando Leijenhorst, and Victor Magron

May 2026

arXiv Bib url

@unpublished{KLM26_nc_convergence,
  title = {Quantitative semidefinite certificates for ground-state energies of Pauli Hamiltonians},
  author = {Klep, Igor and Leijenhorst, Nando and Magron, Victor},
  publisher = {arXiv},
  month = may,
  year = {2026},
}

Preprint

Robust self-testing with CHSH mod 3

Igor Klep, Nando Leijenhorst, and Victor Magron

Apr 2026

arXiv Bib url

@unpublished{KLM26,
  title = {Robust self-testing with CHSH mod 3},
  author = {Klep, Igor and Leijenhorst, Nando and Magron, Victor},
  publisher = {arXiv},
  month = apr,
  year = {2026},
}

Preprint

Optimality and uniqueness of the D_4 root system

David de Laat, Nando Leijenhorst, and Willem H. H. de Muinck Keizer

Apr 2024

arXiv Bib url

@unpublished{dLLdMK24,
  title = {Optimality and uniqueness of the D_4 root system},
  author = {{de Laat}, David and Leijenhorst, Nando and {de Muinck Keizer}, Willem H. H.},
  publisher = {arXiv},
  month = apr,
  year = {2024},
  keywords = {Mathematics - Metric Geometry}
}