On two misconceptions in current relativistic quantum information

Details On two misconceptions in current relativistic quantum information On two misconceptions in current relativistic quantum information

2011-08-29

arxiv.org/abs/1108.5553v2

Physics

Quantum Physics

11 pages v2: private communication clarified, some points further stressed out, typos fixed

Scientific paper

We describe two problems current relativistic quantum information suffers from. The first point is an explanation of an alleged ambiguity of entropic quantities detected in a number of publications and incorrectly resolved in [M. Montero and E. Martin-Martinez, Physical Review A 83, 062323 (2011)]. We found that the problem arises due to wrong algebraic manipulations with fermions and ignoring the superselection rule for bosons and fermions. This leads to a misinterpretation of certain entropic quantities when applied to fermion fields. The second discussed point is to alert to a conceptual misunderstanding of the role of entanglement (and quantum correlations in general) in some of the studied relativistic scenarios. Instead, we argue in favor of investigating capacities of quantum channels induced by the relevant physical processes as dictated by quantum Shannon theory.

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