X iv : q ua nt - p h / 02 02 16 1 v 1 2 7 Fe b 20 02 Variational - Iterative Solution of Ground State for Central Potential

ar X iv : q ua nt - p h / 02 06 11 6 v 1 1 8 Ju n 20 02 Five Lectures On Dissipative Master Equations

ar X iv : q ua nt - p h / 07 02 21 1 v 1 2 3 Fe b 20 07 Parameter estimation for mixed states from a single copy

Thomas Konrad, Otfried Gühne, Jürgen Audretsch, and Hans J. Briegel 4 School of Pure and Applied Physics, University of KwaZulu-Natal, Private Back X54001, Durban 4000, South Africa Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, A-6020 Innsbruck, Austria Fachbereich Physik, Universität Konstanz, Fach M 674, D-78457 Konstanz, Germany Institut für T...

ar X iv : q ua nt - p h / 02 07 09 6 v 2 1 7 Se p 20 02 Measurement of qutrits

We proposed the procedure of measuring the unknown state of the three-level system – the qutrit, which was realized as the arbitrary polarization state of the single-mode biphoton field. This procedure is accomplished for the set of the pure states of qutrits; this set is defined by the properties of SU(2) transformations, that are done by the polarization transformers.

ar X iv : q ua nt - p h / 02 11 05 7 v 1 1 1 N ov 2 00 2 Recursive Weak - and Strong Coupling Expansions in a Cosine Potential

For the Cos(2x)-Potential the coefficients of the weak-and strong coupling perturbation series of the ground state energy are constructed recur-sively. They match the well-known expansion coefficients of the Mathieu equation's characteristic values. However presently there is no physically intuitive method to extract the coefficients of the strong coupling series from those of the weak one. The...

ar X iv : q ua nt - p h / 03 02 14 3 v 1 1 9 Fe b 20 03 On the Correlations Between Quantum Entanglement and q - Information Measures

In the present study we revisit the application of the q-information measures R q of Rényi's and S q of Tsallis' to the discussion of special features of two qubits systems. More specifically, we study the correlations between the q-information measures and the entanglement of formation of a general (pure or mixed) state ρ describing a system of two qubits. The analysis uses a Monte Carlo proce...