Mixed-state sensitivity of several quantum-information benchmarks

An imbalance between the sensitivity of the common state measures, such as fidelity, trace distance, concurrence, tangle and von Neumann entropy, when acted on a depolarizing channel, was investigated. The fidelity for more general entangled two-qubit mixed quantum states were examined to understand the benchmark states for quantum-information protocols. Two classes of two-qubit entangled states acted on with depolarizing channels mainly nonmaximally entangled states and maximally entangled mixed states. It was found that the classes of states were chosen because they allowed to study mixed-state entanglement for states of current interest and also shows that how these states change under uniform depolarization.