Mixed state sensitivity of several quantum information benchmarks

Details Mixed state sensitivity of several quantum information benchmarks Mixed state sensitivity of several quantum information benchmarks

2004-07-22

arxiv.org/abs/quant-ph/0407172v2

PRA v70, 052309, (2004)

Physics

Quantum Physics

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

Scientific paper

10.1103/PhysRevA.70.052309

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.

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