Discrete Time Quantum Walk Approach to State Transfer

We show that a quantum state transfer, previously studied as a continuous time process in networks of interacting spins, can be achieved within the model of discrete time quantum walks with position dependent coin. We argue that due to additional degrees of freedom, discrete time quantum walks allow to observe effects which cannot be observed in the corresponding continuous time case. First, we study a discrete time version of the engineered coupling protocol due to Christandl et. al. [Phys. Rev. Lett. 92, 187902 (2004)] and then discuss the general idea of conversion between continuous time quantum walks and discrete time quantum walks.Comment: 9 pages, 6 figures, comments welcom

Probabilistic coding of quantum states

We discuss properties of probabilistic coding of two qubits to one qutrit and generalize the scheme to higher dimensions. We show that the protocol preservers entanglement between qubits to be encoded and environment and can be also applied to mixed states. We present the protocol which enables encoding of n qudits to one qudit of dimension smaller than the Hilbert space of the original system and then probabilistically but error-free decode any subset of k qudits. We give a formula for the probability of successful decoding

Numerical Simulations of Torsional Alfv\'en Waves in Axisymmetric Solar Magnetic Flux Tubes

We investigate numerically Alfv\'en waves propagating along an axisymmetric and non-isothermal solar flux tube embedded in the solar atmosphere. The tube magnetic field is current-free and diverges with height, and the waves are excited by a periodic driver along the tube magnetic field lines. The main results are that the two wave variables, the velocity and magnetic field perturbations in the azimuthal direction, behave differently as a result of gradients of physical parameters along the tube. To explain these differences in the wave behavior, the time evolution of the wave variables and the resulting cutoff period for each wave variable are calculated, and used to determine regions in the solar chromosphere where strong wave reflection may occur.Comment: Submitted to Solar Physics (accepted

Liquid phase contained in porous rock as observed by proton magnetic relaxation

High power proton relaxometry was applied to investigate the liquid phase contained in porous rock. Proton free induction decays and spin-lattice relaxation times allowed us to investigate the pore distribution and the contribution of mobile and of immobilized liquid. The differences in pore distributions in oil-containing limestone and in Węglowicki sandstone were found. The fractal exponent for pore distribution in Węglowicki sandstone was fitted using both stretched exponential and modified stretched exponential models. The results of both approaches are compared

WORLD ECONOMIC RECESSION VS. LABOUR MARKET GLOBALIZATION

Стаття присвячена оцінці впливу глобалізації і світової кризи на розвиток польської економіки. Визначено тенденції розвитку ринку праці в країнах Європейської спільноти. Проаналізовано роль держави у регулюванні процесів економічної взаємодії. Розглянуто моделі глобалізації на основі утворення регіональних об’єднань. Запропоновано рекомендації для адаптації польського ринку праці до нових економічних умов.The paper is dealt with evaluation of labour market globalization and global economic recession impacts on Polish economic growth. Trends of labour market changes in EU countries are determined. The role of the government in regulation of economic interactions processes is analyzed. The paper also considers models of globalization on the basis of developing regional systems. Some guidelines are proposed to adapt Polish labour market to new economic conditions

EWOLUCJA MODELU SYMULACYJNEGO SYSTEMU SAMOREGULACJI NAPRĘŻENIA TAŚMY W TRYBIE DYNAMICZNYM W LINII CIĄGŁEGO CYNKOWANIA NA GORĄCO

The paper deals with the peculiarities of development of simulation model of strip pull self-regulation system in a continuous hot galvanizing line. The results of simulation modelling are provided.W artykule rozpatrzono cechy szczególne konstruowania modelu symulacyjnego systemu regulacji naprężenia taśmy w linii ciągłej cynkowania na gorąco. Przedstawiono wyniki badań symulacyjnych