Journal
THEORETICAL AND MATHEMATICAL PHYSICS
Volume 182, Issue 3, Pages 397-406Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1007/s11232-015-0270-6
Keywords
quantum channel; bipartite quantum system; entanglement; von Neumann entropy
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Funding
- Russian Science Foundation [14-21-00162]
- Russian Science Foundation [14-21-00162] Funding Source: Russian Science Foundation
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For a class of bipartite quantum states, we find a nontrivial lower bound on the entropy gain resulting from the action of a tensor product of the identity channel with an arbitrary channel. We use the obtained result to bound the output entropy of the tensor product of a dephasing channel with an arbitrary channel from below. We characterize phase-damping channels that are particular cases of dephasing channels.
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