Journal
PHYSICAL REVIEW A
Volume 85, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.85.012303
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Funding
- EU [2010-248095 (Q-ESSENCE), APVV DO7RP-0002-10, VEGA 2/0092/09 (QWAEN)]
- Russian Foundation for Basic Research [09-02-00142, 10-02-00312, 11-02-00456]
- Russian Science Support Foundation
- Dynasty Foundation
- Ministry of Education and Science of the Russian Federation [2.1.1/5909, Pi558, 14.740.11.1257]
- APVV [LPP-0264-07 (QWOSSI)]
- SCIEX [10.271]
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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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