Transformations on the sets of states and density operators

Lajos Molnár, Werner Timmermann

Research output: Contribution to journalArticle

1 Citation (Scopus)


In this paper we consider two physically relevant numerical quantities (namely, the concurrence and Θ-fidelity) and an operation (called {white diamond suit}-product) defined on the set of all quantum states or density operators. Our main aim is to present the complete descriptions of all bijective transformations which preserve any of these quantities or operation.

Original languageEnglish
Pages (from-to)75-84
Number of pages10
JournalLinear Algebra and Its Applications
Issue number1
Publication statusPublished - Oct 1 2006



  • Concurrence
  • Density operator
  • Preservers
  • State
  • Θ-fidelity

ASJC Scopus subject areas

  • Algebra and Number Theory
  • Numerical Analysis
  • Geometry and Topology
  • Discrete Mathematics and Combinatorics

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