Optimal minimal measurements of mixed states

Physical Review A - Atomic, Molecular, and Optical Physics

Volumn 60, Issue 1, 1999, Pages 126-135

  Vidal, G ^a   Latorre, J I ^a   Pascual, P ^a   Tarrach, R ^a  

^a UNIVERSITY OF BARCELONA   (Spain)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000338347     PISSN: 10502947     EISSN: 10941622     Source Type: Journal    
DOI: 10.1103/PhysRevA.60.126     Document Type: Article

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13. Strong symmetry means (Formula presented), which implies (Formula presented) and strong isotropy means that (Formula presented) is a tensor that depends only on the vector (Formula presented) and the invariant tensors. It is obvious that optimal cloners can be chosen to be symmetric and that as (Formula presented) is isotropic optimal cloners will not break this isotropy.
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