A problem relating to positive linear maps on matrix algebras |
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Authors: | PM Alberti A Uhlmann |
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Institution: | Department of Physics and NTZ, Karl-Marx-University, Leipzig, G.D.R. Germany |
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Abstract: | In this paper we investigate conditions under which two finite-dimensional density matrices can be transformed simultaneously into two other ones by means of a positive linear map which maps density matrices into density matrices. The result of this paper provides a complete answer in case of the matrix algebra of two-by-two matrices. |
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