Local two-qubit entanglement-annihilating channels

Sergey N. Filippov, Tomáš Rybár, and Mário Ziman
Phys. Rev. A 85, 012303 – Published 4 January 2012

Abstract

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

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  • Received 17 October 2011

DOI:https://doi.org/10.1103/PhysRevA.85.012303

©2012 American Physical Society

Authors & Affiliations

Sergey N. Filippov1, Tomáš Rybár2, and Mário Ziman2,3

  • 1Moscow Institute of Physics and Technology, Moscow Region, Russia
  • 2Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia
  • 3Institute for Theoretical Physics, ETH Zurich, CH-8093 Zurich, Switzerland

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Issue

Vol. 85, Iss. 1 — January 2012

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