216 research outputs found
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
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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
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