Now showing items 1-7 of 7

    • Entanglement and its operational measure 

      Klyachko, Alexander A.; Öztop, Barış; Shumovsky, Alexander S. (Springer, 2006)
      An operational representation of concurrence measuring the entanglement of bipartite systems by means of averages of basic observables is discussed. We prove the validity of this representation for bipartite systems with ...
    • General entanglement 

      Klyachko, Alexander A.; Shumovsky, Alexander S. (IOP, 2006)
      The paper contains a brief review of an approach to quantum entanglement based on analysis of dynamic symmetry of systems and quantum uncertainties, accompanying the measurement of mean value of certain basic observables. ...
    • Persistent perfect entanglement in atomic systems 

      Çakır, Özgür; Can, M. Ali; Klyachko, Alexander A.; Shumovsky, Alexander S. (IOP, 2004)
      It is shown that the system of an even number of three-level atoms in the Λ configuration in a cavity can evolve into a persistent maximum entangled state. The time of formation of such an entangled state is estimated.
    • Quantifying quantum information via uncertainties 

      Öztop, Barış; Klyachko, Alexander A.; Shumovsky, Alexander S. (OSA, 2007)
      We show, for a state ψ of a quantum system with the dynamic symmetry given by the Lie group G, total amount of quantum information and entanglement is provided by summarized uncertainty of basic observables.
    • Quantum marginal problem and N-representability 

      Klyachko, Alexander A. (IOP, 2006)
      A fermionic version of the quantum marginal problem was known from the early sixties as N-representability problem. In 1995 it was mentioned by the National Research Council of the USA as one of ten most prominent research ...
    • Single qutrit entanglement 

      Binicioğlu, Sinem; Klyachko, Alexander A.; Shumovsky, Alexander S. (OSA, 2007)
      We discussed a recent approach to quantum entanglement. The approach is based on presetting of basic observables of quantum system. Entangled states are interpreted as states with maximal amount of uncertainty of all basic ...
    • Spin squeezing and entanglement 

      Öztop, Barış; Klyachko, Alexander A.; Shumovsky, Alexander S. (OSA, 2007)
      We reformulate definition of spin squeezing and spin coherence in terms of the total variance in spin operators. We propose a new measure of spin squeezing. We show equivalence of spin squeezing and spin entanglement.