Local two-qubit entanglement-annihilating channels

Details Local two-qubit entanglement-annihilating channels Local two-qubit entanglement-annihilating channels

2011-10-17

arxiv.org/abs/1110.3757v1

Phys. Rev. A 85, 012303 (2012)

Physics

Quantum Physics

10 pages, 5 figures

Scientific paper

10.1103/PhysRevA.85.012303

We address the problem of the robustness of entanglement of bipartite systems (qubits) interacting with dynamically independent environments. In particular, we focus on characterization of so-called local entanglement-annihilating two-qubit channels, which set the maximum permissible noise level allowing to perform entanglement-enabled experiments. The differences, but also subtle relations between entanglement-breaking and local entanglement-annihilating channels are emphasized. A detailed characterization of latter ones is provided for a variety of channels including depolarizing, unital, (generalized) amplitude-damping, and extremal channels. We consider also the convexity structure of local entanglement-annihilating qubit channels and introduce a concept of entanglement-annihilation duality.

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