Search results for "ComputerSystemsOrganization_MISCELLANEOUS"
showing 10 items of 56 documents
Impact and Evaluation of Major Sporting Events
2006
Ever more cities and countries are bidding to stage major sporting events. One of the main reasons for this is the economic benefit expected by decision makers and citizens. From the perspective of...
The fail of determinism and the limits of Bohm hidden variable theory
2009
We give a counter example to show that determinism as such is in contradiction to quantum mechanics. More precisely, we consider a simple quantum system and its environment, including the measurement device, and make the assumption that the time evolution of the global system, the quantum system plus this environment, is deterministic, i. e., the time evolution is given by a dynamical trajectory from some initial conditions. From this, we prove a type of Bell inequalities which are violated by quantum mechanics, reaching the conclusion that our quantum system evolves in a non deterministic way. In order to seize the interest of this conclusion, one must realize that it cannot be reached fro…
Analog quantum simulation of the Rabi model in the ultra-strong coupling regime
2017
The quantum Rabi model describes the fundamental mechanism of light-matter interaction. It consists of a two-level atom or qubit coupled to a quantized harmonic mode via a transversal interaction. In the weak coupling regime, it reduces to the well-known Jaynes–Cummings model by applying a rotating wave approximation. The rotating wave approximation breaks down in the ultra-strong coupling regime, where the effective coupling strength g is comparable to the energy ω of the bosonic mode, and remarkable features in the system dynamics are revealed. Here we demonstrate an analog quantum simulation of an effective quantum Rabi model in the ultra-strong coupling regime, achieving a relative coup…
Ultrafast Long-Distance Quantum Communication with Static Linear Optics
2015
We propose a projection measurement onto encoded Bell states with a static network of linear optical elements. By increasing the size of the quantum error correction code, both Bell measurement efficiency and photon-loss tolerance can be made arbitrarily high at the same time. As a main application, we show that all-optical quantum communication over large distances with communication rates similar to those of classical communication is possible solely based on local state teleportations using optical sources of encoded Bell states, fixed arrays of beam splitters, and photon detectors. As another application, generalizing state teleportation to gate teleportation for quantum computation, we…
Recent Developments in Quantum Algorithms and Complexity
2014
We survey several recent developments in quantum algorithms and complexity: Reichardt’s characterization of quantum query algorithms via span programs [15]; New bounds on the number of queries that are necessary for simulating a quantum algorithm that makes a very small number of queries [2]; Exact quantum algorithms with superlinear advantage over the best classical algorithm [4].
Difficulties in learning and teaching of Quantum Physics in High School
2013
Quantum Physics is a very important part of Physics. In this paper we analyze its teaching and learning in high school and we show the students’ main difficulties, particularly the ontological and epistemological. This article presents some reasoned arguments against traditional methods to teach Quantum Physics. Finally, a new approach to quantum Physics teaching is showed.
Chaotic multiagent system approach for MRF-based image segmentation
2005
In this paper, we propose a new chaotic approach for image segmentation based on multiagent system (MAS). We consider a set of segmentation agents organized around a coordinator agent. Each segmentation agent performs iterated conditional modes (ICM) starting from its own initial image created using a chaotic mapping. The coordinator agent diversifies the initial images using a crossover and a chaotic mutation operators. The efficiency of our chaotic MAS approach is shown through some experimental results.
An Activity Theory Perspective on Creating a New Digital Government Service in Finland
2019
Digitalization of government services is a central goal in many countries. At policy-making level, digital government services are often expected to simultaneously reduce cost and provide citizens with better and more versatile services. Development of new digital government services, however, often involves companies, which typically have differences in their approach to the development and implementation of new digital services compared to the public sector. This study applies activity theory as a lens to identify the similarities and differences between the private and public sector in the development and implementation of a new government digital service. The aim is to identify the cont…
Creative city, mobility, and creativity: Finnish artists in Berlin
2019
ABSTRACTCreative city, creativity, and mobility are interconnected. The creative city research focuses on long-term mobility of the creative class members: they ‘move in’ to a creative city. ‘Once ...
Quantum Computers and Quantum Automata
2000
Quantum computation is a most challenging project involving research both by physicists and computer scientists. The principles of quantum computation differ from the principles of classical computation very much. When quantum computers become available, the public-key cryptography will change radically. It is no exaggeration to assert that building a quantum computer means building a universal code-breaking machine. Quantum finite automata are expected to appear much sooner. They do not generalize deterministic finite automata. Their capabilities are incomparable.