Ancilla-Driven Universal Quantum Computation

We propose a method of manipulating a quantum register remotely with the help of a single ancilla that steers the evolution of the register. The fully controlled ancilla qubit is coupled to the computational register solely via a fixed unitary two-qubit interaction, E, and then measured in suitable bases. We characterize all interactions E that induce a unitary, step-wise deterministic measurement back-action on the register sufficient to implement any arbitrary quantum channel. Our scheme offers significant experimental advantages for implementing computations, preparing states and performing generalized measurements as no direct control of the register is required.Comment: 4 pages, 3 figure

Delocalization power of global unitary operations on quantum information

We investigate how originally localized two pieces of quantum information represented by a tensor product of two unknown qudit states are delocalized by performing two-qudit global unitary operations. To characterize the delocalization power of global unitary operations on quantum information, we analyze the necessary and sufficient condition to deterministically relocalize one of the two pieces of quantum information to its original Hilbert space by using only LOCC. We prove that this LOCC one-piece relocalization is possible if and only if the global unitary operation is local unitary equivalent to a controlled-unitary operation. The delocalization power and the entangling power characterize different non-local properties of global unitary operations.Comment: 14 pages, 1 figur

Проект энергоблока АЭС с реактором типа ВВЭР-600

Объектом исследования является проект энергоблока с реактором ВВЭР-600. Цель работы – расчет реакторной установки, парогенератора, принципиальной схемы ПТУ методом энергетического баланса, конденсационной установки и регенеративного подогревателя низкого давления поверхностного типа. В процессе работы рассчитаны и спроектированы основные составляющие ядерной энергетической установки: реакторная установка, парогенератор, расчет на прочность парогенераторной установки.The object of research is the development of a power unit with VVER-600. The purpose of the work – calculation of reactor plant, steam generator schematic diagrams of the PTU method energy balance of the condensing unit and the regenerative heater low pressure surface type. In the process, designed the basic components of a nuclear power plant: reactor, steam generator, calculating the strength of steam plant. Final qualifying work is executed in a text editor Microsoft word 2010, graphs are constructed in a workbook in Microsoft Excel 2010, and the drawings made with the program Corel DRAWX5, equation editor Math CAD 15

Investigating Users’ IT Adaptation Behaviors: A Case of a Computerized Work System

IS research has shown that successful IT implementation projects rely on the extent to which IT users respond and adapt to the new technology and the changes the new technology comes with. Although the phenomenon of user IT adaptation has been studied previously in IS literature our understating of user IT adaptation is still limited. Drawing on the Coping Model of User Adaptation (CMUA) and the Approach vs. Avoidance model of coping, this study seeks to investigate how different user adaptation efforts evolve over time and subsequently influence IT use outcomes. Using a qualitative case study approach, 68 interviews were conducted at a medical center in Iran after the implementation of a Work System Computerization project. Our results indicate that emotions have a great influence on IT users’ adaptation efforts. Also, users’ IT appraisal might not necessarily happen in sequence as suggested by existing literature. Finally, our findings highlight the theoretical importance of preserving the distinction between approach- and avoidance-oriented emotion-focused adaptation efforts in exploring how emotion-focused efforts may influence system usage

Completeness of algebraic CPS simulations

The algebraic lambda calculus and the linear algebraic lambda calculus are two extensions of the classical lambda calculus with linear combinations of terms. They arise independently in distinct contexts: the former is a fragment of the differential lambda calculus, the latter is a candidate lambda calculus for quantum computation. They differ in the handling of application arguments and algebraic rules. The two languages can simulate each other using an algebraic extension of the well-known call-by-value and call-by-name CPS translations. These simulations are sound, in that they preserve reductions. In this paper, we prove that the simulations are actually complete, strengthening the connection between the two languages.Comment: In Proceedings DCM 2011, arXiv:1207.682

Flood resilience community pathfinder evaluation: rapid evidence assessment

The increase in the risk of flooding as a result of extreme weather and climate change makes it essential for local authorities and communities to engage with this issue. Defra is providing grant funding to 13 local authorities throughout England under a new Flood Resilience Community Pathfinder (FRCP) scheme aimed at stimulating community action to increase resilience. The measures being developed include property-level protection, flood resilience groups, volunteer flood wardens and community champions, engagement with more vulnerable groups and efforts to increase financial resilience

Optical generation of matter qubit graph states

We present a scheme for rapidly entangling matter qubits in order to create graph states for one-way quantum computing. The qubits can be simple 3-level systems in separate cavities. Coupling involves only local fields and a static (unswitched) linear optics network. Fusion of graph state sections occurs with, in principle, zero probability of damaging the nascent graph state. We avoid the finite thresholds of other schemes by operating on two entangled pairs, so that each generates exactly one photon. We do not require the relatively slow single qubit local flips to be applied during the growth phase: growth of the graph state can then become a purely optical process. The scheme naturally generates graph states with vertices of high degree and so is easily able to construct minimal graph states, with consequent resource savings. The most efficient approach will be to create new graph state edges even as qubits elsewhere are measured, in a `just in time' approach. An error analysis indicates that the scheme is relatively robust against imperfections in the apparatus.Comment: 10 pages in 2 column format, includes 4 figures. Problems with figures resolve

Verification of Quantum Computation: An Overview of Existing Approaches

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