Mixed-state sensitivity of several quantum-information benchmarks

  title={Mixed-state sensitivity of several quantum-information benchmarks},
  author={Nicholas Peters and Tzu-Chieh Wei and Paul Kwiat},
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… CONTINUE READING