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Limitation for linear maps in a class for detection and quantification of bipartite nonclassical correlation

Authors
  • SaiToh, Akira
  • Rahimi, Robabeh
  • Nakahara, Mikio
Type
Published Article
Publication Date
Jun 27, 2012
Submission Date
Dec 28, 2010
Source
arXiv
License
Yellow
External links

Abstract

Eigenvalue-preserving-but-not-completely-eigenvalue-preserving (EnCE) maps were previously introduced for the purpose of detection and quantification of nonclassical correlation, employing the paradigm where nonvanishing quantum discord implies the existence of nonclassical correlation. It is known that only the matrix transposition is nontrivial among Hermiticity-preserving (HP) linear EnCE maps when we use the changes in the eigenvalues of a density matrix due to a partial map for the purpose. In this paper, we prove that this is true even among not-necessarily HP (nnHP) linear EnCE maps. The proof utilizes a conventional theorem on linear preservers. This result imposes a strong limitation on the linear maps and promotes the importance of nonlinear maps.

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