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Artykuły (WFAIS) Przeglądanie wg słów kluczowych "Quantum Physics"

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Artykuły (WFAIS) Przeglądanie wg słów kluczowych "Quantum Physics"

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  • Quantum Mechanics of Damped Systems II. Damping and Parabolic Potential Barrier 
    Chruściński, Dariusz (2003-07-23)
    We investigate the resonant states for the parabolic potential barrier known also as inverted or reversed oscillator. They correspond to the poles of meromorphic continuation of the resolvent operator to the complex energy ...
  • 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 ...
  • Remarks on the GNS Representation and the Geometry of Quantum States 
    Chruściński, Dariusz; Marmo, Giuseppe (2008-10-09)
    It is shown how to introduce a geometric description of the algebraic approach to the non-relativistic quantum mechanics. It turns out that the GNS representation provides not only symplectic but also Hermitian realization ...
  • 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 ...
  • Spectral properties of the squeeze operator 
    Chruściński, Dariusz (2004-03-15)
    We show that a single-mode squeeze operator S(z) being an unitary operator with a purely continuous spectrum gives rise to a family of discrete real generalized eigenvalues. These eigenvalues are closely related to the ...
  • The observables of a dissipative quantum system 
    Chruściński, Dariusz; Facchi, Paolo; Marmo, Giuseppe; Pascazio, Saverio (2011-02-08)
    A time-dependent product is introduced between the observables of a dissipative quantum system, that accounts for the effects of dissipation on observables and commutators. In the $t \to \infty$ limit this yields a contracted ...
  • Wigner function and Schroedinger equation in phase space representation 
    Chruściński, Dariusz; Młodawski, Krzysztof (2005-01-27)
    We discuss a family of quasi-distributions (s-ordered Wigner functions of Agarwal and Wolf) and its connection to the so called phase space representation of the Schroedinger equation. It turns out that although Wigner ...
  • Wigner function for damped systems 
    Chruściński, Dariusz (2002-09-04)
    Both classical and quantum damped systems give rise to complex spectra and corresponding resonant states. We investigate how resonant states, which do not belong to the Hilbert space, fit the phase space formulation of ...
  • Witnessing quantum discord in 2 x N systems 
    Bylicka, Bogna; Chruściński, Dariusz (2010-04-03)
    Bipartite states with vanishing quantum discord are necessarily separable and hence positive partial transpose (PPT). We show that 2 x N states satisfy additional property: the positivity of their partial transposition is ...