English

Mixed state sensitivity of several quantum information benchmarks

Quantum Physics 2007-05-23 v2

Abstract

We investigate an imbalance between the sensitivity of the common state measures--fidelity, trace distance, concurrence, tangle, von Neumann entropy and linear entropy--when acted on by a depolarizing channel. Further, in this context we explore two classes of two-qubit entangled mixed states. Specifically, we illustrate a sensitivity imbalance between three of these measures for depolarized (i.e., Werner-state like) nonmaximally entangled and maximally entangled mixed states, noting that the size of the imbalance depends on the state's tangle and linear entropy.

Keywords

Cite

@article{arxiv.quant-ph/0407172,
  title  = {Mixed state sensitivity of several quantum information benchmarks},
  author = {Nicholas A. Peters and Tzu-Chieh Wei and Paul G. Kwiat},
  journal= {arXiv preprint arXiv:quant-ph/0407172},
  year   = {2007}
}

Comments

6 pages, 3 figures; corrected typos and expression (17)