Universal Quantum Computation through Control of Spin-Orbit Coupling

We propose a method for quantum computation which uses control of spin-orbit coupling in a linear array of single electron quantum dots. Quantum gates are carried out by pulsing the exchange interaction between neighboring electron spins, including the anisotropic corrections due to spin-orbit coupling. Control over these corrections, even if limited, is sufficient for universal quantum computation over qubits encoded into pairs of electron spins. The number of voltage pulses required to carry out either single qubit rotations or controlled-Not gates scales as the inverse of a dimensionless measure of the degree of control of spin-orbit coupling.Comment: 4 pages, 3 figures (minor revision, references added

Evaluation of the Innovation Potential of the Regions of the Central Federal District of the Russian Federation

The present article analyzes the current approaches to the evaluation of innovation potential of the individual territories of the Russian Federation. The technique of evaluation of the innovation potential on the example of the Central Federal District regions by means of the functional model of evaluation is given consideration to. The algorithm of the innovation potential evaluation proposed by the authors includes six groups of indexes integrating twenty-eight individual indicator

Regional aspects of sectoral digitalization : problems and prospects

Purpose: At present, high and sometimes record indicators have been achieved for the individual branches of agricultural production. Further intensive development of agriculture is due to the search for new ways to increase labor productivity and lower production costs which is the main aim of this research. Design/Methodology/Approach: The methodological basis served as a systematic approach, which ensured comprehensiveness and purposefulness. Analytical, abstract-logical, economic-statistical, monographic and experimental research methods were also used in this work to examine problems and prospects of sectoral digitalization. Findings: The agro-industrial complex demonstrates the growth of production indicators and is on the rise. The target indicators, laid down in the Food Security Doctrine, have already been achieved by many indices. To a large extent, it is due to a significant increase in the agro-industrial complex. Practical implications: A proposed platform that would ensure a breakthrough in further technical modernization of production, can be created only if the technologies are improved based on their digitalization and orientation towards a specific consumer. Originality/Value: The pin-point introduction of digital technologies in agricultural production confirms the high efficiency of the full innovative technical modernization. The proposed digital transformation of management in the agro-industrial complex of Russia is the value of this research with its originality compared to other ideas.peer-reviewe

Quantum rings as electron spin beam splitters

Quantum interference and spin-orbit interaction in a one-dimensional mesoscopic semiconductor ring with one input and two output leads can act as a spin beam splitter. Different polarization can be achieved in the two output channels from an originally totally unpolarized incoming spin state, very much like in a Stern-Gerlach apparatus. We determine the relevant parameters such that the device has unit efficiency.Comment: 4 pages, 3 figures; minor change

q-Functional Wick's theorems for particles with exotic statistics

In the paper we begin a description of functional methods of quantum field theory for systems of interacting q-particles. These particles obey exotic statistics and are the q-generalization of the colored particles which appear in many problems of condensed matter physics, magnetism and quantum optics. Motivated by the general ideas of standard field theory we prove the q-functional analogues of Hori's formulation of Wick's theorems for the different ordered q-particle creation and annihilation operators. The formulae have the same formal expressions as fermionic and bosonic ones but differ by a nature of fields. This allows us to derive the perturbation series for the theory and develop analogues of standard quantum field theory constructions in q-functional form.Comment: 15 pages, LaTeX, submitted to J.Phys.

Один із методів скидання авіаційного підвісного блока із змінною геометрією

One method to drop the aviation outboard block with variable geometry is proposed. Forgrounding of this method the calculation and exploration of aerodynamic characteristics of the outboardblock, which consists of the outward cylindrical body and inside a sharp body of rotation with a tail plumage,is performed. Estimation of the implementation possibility of a method to drop such block is carriedout alsoВыполнены расчет и исследования аэродинамических характеристик подвесного блока, который состоит из внешнего цилиндрического корпуса и внутреннего острого тела вращения с хвостовым оперением для обоснования этого метода. Проведена оценка возможности реализации данного метода сбросаВиконані розрахунок і дослідження аеродинамічних характеристик підвісного блока, який складається із зовнішнього циліндричного корпуса і внутрішнього гострого тіла обертання з хвостовим оперенням для обґрунтування цього методу. Проведено оцінювання можливості реалізації даного методу скиданн

Quantum-dot spin qubit and hyperfine interaction

We review our investigation of the spin dynamics for two electrons confined to a double quantum dot under the influence of the hyperfine interaction between the electron spins and the surrounding nuclei. Further we propose a scheme to narrow the distribution of difference in polarization between the two dots in order to suppress hyperfine induced decoherence.Comment: 12 pages, 3 figures; Presented as plenary talk at the annual DPG meeting 2006, Dresden (to appear in Advances in Solid State Physics vol. 46, 2006

Experimental study of the decay KL0→π0ννˉK_L^0\to\pi^0\nu\bar{\nu}

The first dedicated search for the rare neutral-kaon decay $K_L^0\to\pi^0\nu\bar{\nu}$ has been carried out in the E391a experiment at the KEK 12-GeV proton synchrotron. The final upper limit of 2.6 $\times 10^{-8}$ at the 90% confidence level was set on the branching ratio for the decay.Comment: 23 pages, 27 figures, accepted for publication as a regular article in Physical Review

Role and responsibilities of a teacher in the lifelong learning sector

Teaching is quite challenging and demanding alongside with many other careers. The main role of every teacher is to involve and engage your students in learning activities. An appropriate level of language, appropriate terms understandable to your students will motivate them to learn mor