High probability state transfer in spin-1/2 chains: Analytical and numerical approaches

This article is devoted to the development of analytical and numerical approaches to the problem of the end-to-end quantum state transfer along the spin-1/2 chain using two methods: (a) a homogeneous spin chain with week end bonds and equal Larmor frequencies and (b) a homogeneous spin chain with end Larmor frequencies different from inner ones. A tridiagonal matrix representation of the XY Hamiltonian with nearest neighbor interactions relevant to the quantum state transfer is exactly diagonalized for a combination of the above two methods. In order to take into account interactions of the remote spins we used numerical simulations of the quantum state transfer in ten-node chains. We compare the state transfer times obtained using the two above methods for chains governed by the both XY and XXZ Hamiltonians and using both nearest neighbor and all node interactions.Comment: 16 pages, 5 figure

The effect of electron surface scattering on fine metal particle electromagnetic radiation absorption

The magnetic dipole absorption cross section of a spherically shaped metal particle was calculated in terms of kinetic approach. The particle considered was placed in the field of a plane electromagnetic wave. The model of boundary conditions was investigated taking into account the dependence of the reflectivity coefficient both on the surface roughness parameter and on the electron incidence angle. The results obtained were compared with theoretical computation results for a model of combined diffusion-specular boundary conditions of Fuchs.Comment: 9 pages, 5 figure

Long-distance entanglement and quantum teleportation in XX spin chains

Isotropic XX models of one-dimensional spin-1/2 chains are investigated with the aim to elucidate the formal structure and the physical properties that allow these systems to act as channels for long-distance, high-fidelity quantum teleportation. We introduce two types of models: I) open, dimerized XX chains, and II) open XX chains with small end bonds. For both models we obtain the exact expressions for the end-to-end correlations and the scaling of the energy gap with the length of the chain. We determine the end-to-end concurrence and show that model I) supports true long-distance entanglement at zero temperature, while model II) supports {\it ``quasi long-distance''} entanglement that slowly falls off with the size of the chain. Due to the different scalings of the gaps, respectively exponential for model I) and algebraic in model II), we demonstrate that the latter allows for efficient qubit teleportation with high fidelity in sufficiently long chains even at moderately low temperatures.Comment: 9 pages, 6 figure

Multiple Quantum NMR Dynamics in Dipolar Ordered Spin Systems

We investigate analytically and numerically the Multiple Quantum (MQ) NMR dynamics in systems of nuclear spins 1/2 coupled by the dipole-dipole interactions in the case of the dipolar ordered initial state. We suggest two different methods of MQ NMR. One of them is based on the measurement of the dipolar temperature in the quasi-equilibrium state which establishes after the time of order T2 after the MQ NMR experiment. The other method uses an additional resonance 45^0 -pulse after the preparation period of the standard MQ NMR experiment in solids. Many-spin clusters and correlations are created faster in such experiments than in the usual MQ NMR experiments and can be used for the investigation of many-spin dynamics of nuclear spins in solids.Comment: 11 pages, 3 figures. accepted for publication in Physical Review

Practice of spiritual-commercial movement as a phenomenon of the consumer society

Спиритуально-коммерческое движение один из ярчайших примеров влияния общества потребления на область религии, более того, влияния парадигмы потребления на духовную жизнь человека. Существует проблема атрибуции спиритуально-коммерческого движения как религиозного явления. На наш взгляд выведение его за рамки религиозного уводит нас от понимания духовных основ этого феномена. Ряд аспектов спиритуально-коммерческого движения рассматривается в статье: его религиозный характер, приверженность неклассической этике, связь с парадигмой потребления. В работе рассматривается возможность применения понятия потребительской идентичности, которое широко используется в маркетинговых исследованиях, для описания поведения людей входящих в СКД (участниц женских практик). Женские практики это практики, относящиеся к спиритуально-коммерческому движению, содержащие идеи религиозного характера, направленные на достижение "женственности". Результаты исследований ряда спиритуально-коммерческих движений Среднего Урала представлены в данной работе.Spiritual-commercial movement is one of the most striking examples of the impact of the consumer society on the sphere of religion. Moreover, it is the influence of the consumption paradigm on the spiritual life of man. There is a problem of attribution of the spiritual-commercial movement as a religious phenomenon. In our view moving it away from the realm of the religious leads us away from understanding the spiritual foundations of this phenomenon. Several aspects of spiritual-commercial movement are considered in this article: its religious character, commitment to non-classical ethics, and connection with the consumption. In this research discussed the possibility of applying the concept of consumer identity, which is widely used in marketing research, as a tool to describe the behavior of people why practice SCM (the women's practices participators). Women's practices are belonged to spiritually-commercial movement, contain religious ideas, help to achieve "femininity". The results of several studies of the spiritual-commercial movements of the Middle Urals are presented in this paper.Программа развития УрФУ на 2013 год (п.2.1.2.1