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Przeglądanie wg autora "Kossakowski, Andrzej"

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Przeglądanie wg autora "Kossakowski, Andrzej"

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  • On the symmetry of the seminal Horodecki state 
    Chruściński, Dariusz; Kossakowski, Andrzej (2010-09-22)
    It is shown that the seminal Horodecki 2-qutrit state belongs to the class of states displaying symmetry governed by a commutative subgroup of the unitary group U(3). Taking a conjugate subgroup one obtains another classes ...
  • Quantum states with strong positive partial transpose 
    Chruściński, Dariusz; Jurkowski, Jacek; Kossakowski, Andrzej (2007-10-10)
    We construct a large class of bipartite M x N quantum states which defines a proper subset of states with positive partial transposes (PPT). Any state from this class is PPT but the positivity of its partial transposition ...
  • Rotationally invariant multipartite states 
    Chruściński, Dariusz; Kossakowski, Andrzej (2006-07-06)
    We construct a class of multipartite states possessing rotational SO(3) symmetry -- these are states of K spin-j_A particles and K spin-j_B particles. The construction of symmetric states follows our two recent papers ...
  • Spectral conditions for entanglement witnesses vs. bound entanglement 
    Chruściński, Dariusz; Kossakowski, Andrzej; Sarbicki, Gniewomir (2009-08-19)
    It is shown that entanglement witnesses constructed via the family of spectral conditions are decomposable, i.e. cannot be used to detect bound entanglement. It supports several observations that bound entanglement reveals ...
  • Spectral conditions for positive maps 
    Chruściński, Dariusz; Kossakowski, Andrzej (2008-09-29)
    We provide a partial classification of positive linear maps in matrix algebras which is based on a family of spectral conditions. This construction generalizes celebrated Choi example of a map which is positive but not ...