• DOI:10.1007/s11128-021-03193-y
• Corpus ID: 211677703

The decompositions of Werner and isotropic states

@article{Yang2021TheDO,
  title={The decompositions of Werner and isotropic states},
  author={Ma-Cheng Yang and Jun-Li Li and Cong-Feng Qiao},
  journal={Quantum Inf. Process.},
  year={2021},
  volume={20},
  pages={1-11}
}

• Ma-Cheng Yang, Jun-Li Li, C. Qiao
• Published 2 March 2020
• Mathematics
• Quantum Inf. Process.

The decompositions of separable Werner state, and also isotropic state, are well-known tough issues in quantum information theory, in this work we investigate them in the Bloch vector representation, exploring the symmetric informationally complete positive operator-valued measure (SIC-POVM) in the Hilbert space. We successfully get the decomposition for arbitrary $N\times N$ Werner state in terms of regular simplexes. Meanwhile, the decomposition of isotropic state is found to be related to the decomposition of Werner state via partial transposition. It is interesting to note that in the large $N$ limit, while the Werner states are either separable or non-steerably entangled, most of the isotropic states tend to be steerable.