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Przeglądanie wg autora "Pytel, Justyna"

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Przeglądanie wg autora "Pytel, Justyna"

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  • Constructing new optimal entanglement witnesses 
    Chruściński, Dariusz; Pytel, Justyna; Sarbicki, Gniewomir (2009-07-14)
    We provide a new class of indecomposable entanglement witnesses. In 4 x 4 case it reproduces the well know Breuer-Hall witness. We prove that these new witnesses are optimal and atomic, i.e. they are able to detect the ...
  • Constructing optimal entanglement witnesses. II 
    Chruściński, Dariusz; Pytel, Justyna (2010-06-15)
    We provide a class of optimal nondecomposable entanglement witnesses for 4N x 4N composite quantum systems or, equivalently, a new construction of nondecomposable positive maps in the algebra of 4N x 4N complex matrices. ...
  • Optimal entanglement witnesses from generalized reduction and Robertson maps 
    Chruściński, Dariusz; Pytel, Justyna (2011-03-02)
    We provide a generalization of the reduction and Robertson positive maps in matrix algebras. They give rise to a new class of optimal entanglement witnesses. Their structural physical approximation is analyzed. As a byproduct ...