International Journal of Theoretical Physics

, Volume 53, Issue 9, pp 2923–2930 | Cite as

Concrete Representation and Separability Criteria for Symmetric Quantum State

  • Chang’e Li
  • Yuanhong Tao
  • Jun Zhang
  • Linsong Li
  • Hua Nan
Article
First Online:
Received:
Accepted:

Abstract

Using the typical generators of the special unitary groups S U(2), the concrete representation of symmetric quantum state is established, then the relations satisfied by those coefficients in the representation are presented. Based on the representation of density matrix, the PPT criterion and CCNR criterion are proved to be equivalent on judging the separability of symmetric quantum states. Moreover, it is showed that the matrix Γ ρ of symmetric quantum state only has five efficient entries, thus the calculation of ∥Γ ρ ∥ is simplified. Finally, the quantitative expressions of real symmetric quantum state under the ∥Γ ρ ∥ separability criterion are obtained.

Keywords

Symmetric quantum state Density matrix Separability criterion 
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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Chang’e Li
    • 1
  • Yuanhong Tao
    • 1
  • Jun Zhang
    • 1
  • Linsong Li
    • 1
  • Hua Nan
    • 1
  1. 1.Department of MathematicsYanbian UniversityJiLinPeople’s Republic of China

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