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Matthias Kleinmann

Research Fellow

Office: A6.P1.5
Address: Department of Theoretical Physics
University of the Basque Country UPV/EHU
P.O. Box 644
48080 Bilbao
Naturwissenschaftlich-Technische Fakultät
Universität Siegen
Walter-Flex-Straße 3
57068 Siegen, Germany
Homepage: @U Siegen

He moved to a permanent position at the Theoretical Quantum Optics group, Siegen University, Germany.

Research interests

  • Quantum information: entanglement theory · quantum metrology · statistical methods
  • Foundations of quantum theory: tests of quantum theory · sequential measurements · quantum contextuality


(since Oct'14; full publication list on; all preprints on
  • Entanglement between two spatially separated atomic modes
    K. Lange, J. Peise, B. Lücke, I. Kruse, G. Vitagliano, I. Apellaniz, M. Kleinmann, G. Tóth, and C. Klempt

  • Proposed experiment to test fundamentally binary theories
    Phys. Rev. A 96, 032104 (2017), arXiv:1611.05761
    M. Kleinmann, T. Vértesi, and A. Cabello

  • Memory cost for simulating all quantum correlations of the Peres–Mermin scenario
    J. Phys. A: Math. Theor. 50, 325302 (2017), arXiv:1611.07515
    G. Fagundes and M. Kleinmann

  • Optimal witnessing of the quantum Fisher information with few measurements
    Phys. Rev. A 95 (Editor's Suggestion), 032330 (2017), arXiv:1511.05203
    I. Apellaniz, M. Kleinmann, O. Gühne, and G. Tóth

  • Entanglement and extreme spin squeezing of unpolarized states
    New J. Phys. 19, 013027 (2017), arXiv:1605.07202
    G. Vitagliano, I. Apellaniz, M. Kleinmann, B. Lücke, C. Klempt, and G. Tóth

  • Device-independent certification of a nonprojective qubit measurement
    Phys. Rev. Lett. 117, 260401 (2016), arXiv:1604.01417
    E.S. Gómez, S. Gómez, P. González, G. Cañas, J.F. Barra, A. Delgado, G.B. Xavier, A. Cabello, M. Kleinmann, T. Vértesi, and G. Lima

  • Analysing multiparticle quantum states
    in: “Quantum [Un]Speakables II,” edited by R. Bertlmann and A. Zeilinger (Springer, 2016) pp. 345–364, arXiv:1506.06976
    O. Gühne, M. Kleinmann, and T. Moroder

  • Quantum correlations are stronger than all nonsignaling correlations produced by n-outcome measurements
    Phys. Rev. Lett. 117, 150401 (2016), arXiv:1505.04179
    M. Kleinmann and A. Cabello

  • Quantum state-independent contextuality requires 13 rays
    J. Phys. A: Math. Theor. 49 (Letter), 38LT01 (2016), arXiv:1606.01848
    A. Cabello, M. Kleinmann, and J.R. Portillo

  • Necessary and sufficient condition for quantum state-independent contextuality
    Phys. Rev. Lett. 114, 250402 (2015), arXiv:1501.03432
    A. Cabello, M. Kleinmann, and C. Budroni

  • Systematic errors in current quantum state tomography tools
    Phys. Rev. Lett. 114, 080403 (2015), arXiv:1310.8465
    C. Schwemmer, L. Knips, D. Richart, H. Weinfurter, T. Moroder, M. Kleinmann, and O. Gühne

  • Sequences of projective measurements in generalized probabilistic models
    J. Phys. A: Math. Theor. 47, 455304 (2014), arXiv:1402.3583
    M. Kleinmann


  • 13 Jul 2017: High violations of Bell-inequalities and the issue of signaling (talk), ICE-4 conference, Madrid, Spain
  • 7 Jun 2017: Towards a Framework of Probabilistic Bayesian Theories (invited talk), Workshop on Participatory Realism, Stellenbosch, South Africa
  • 2 Jun 2017: Testing the structure of quantum theory (talk), CeQIP 2017, Smolenice, Slovakia
  • 30 May 2017: High violations of Bell-inequalities and the issue of signaling (seminar), Institute for Quantum Optics and Quantum Information (IQOQI), Vienna, Austria
  • 5 May 2017: On the structure of quantum measurements & how to test it (seminar), AlbaNova, U Stockholm, Sweden
  • 6 Mar 2017: Theory-independent conclusions from bipartite quantum correlations (talk), DPG-Frühjahrstagung, Mainz, Germany
  • 6 Oct 2016: Theory-independent conclusions from bipartite quantum correlations (invited talk), Workshop on Temporal quantum correlations and steering, Siegen, Germany
  • 17 Jun 2016: Device-independent demonstration that a qubit is more than a quantum coin (talk), CeQIP 2016, Valtice, Czech Republic
  • 15 Apr 2016: Challenging quantum theory beyond Bell tests (talk), ICE-3 conference, Palma de Mallorca, Spain
  • 2 Mar 2016: Optimal detection of useful quantum entanglement with few expectation values (talk), Spring Meeting of the German Physical Society, Hanover, Germany
  • 29 Feb 2016: Testing an axiom of quantum theory: Which measurements are admissible? (talk), Spring Meeting of the German Physical Society, Hanover, Germany
  • 10 Nov 2015: What can we gain from reconstructions? (invited talk), Workshop on Quantum Correlations, Contextuality and All That... Again, Natal, Rio Grande do Norte, Brazil
  • 24 Aug 2015: Quantum measurements with more than two outcomes: Mathematical freedom meets nature (invited talk), Contextuality: why and how, Linköping, Sweden
  • 11 Aug 2015: Is nature merely dichotomic? (talk), 5th Workshop on Quantum Information, Paraty, Rio de Janeiro, Brazil
  • 9 Jul 2015: Can quantum correlations arise from measurements with only a limited number of outcomes? (invited talk), Workshop on Foundations of Quantum Information, Kelowna, British Columbia, Canada
  • 5 Mar 2015: Current topics in foundations of quantum mechanics Bell inequalities: Kochen-Specker theorem, and generalized probabilistic models (seminar), Basque Center for Applied Mathematics (BCAM), Bilbao, Spain
  • 29 Jan 2015: State-independent contextuality: What it is, and what it is not (seminar), Dep. de Matemática, UFMG Belo Horizonte, Brazil
  • 14 Jan 2015: Challenging the structure of quantum measurements (seminar), Dep. de Física, U Concepción, Chile
  • 5 Nov 2014: Loopholes in contextuality experiments (invited talk), Quantum Contextuality: Trick or Treat, Singapore, Singapore