scholarly journals Cold ion beam in a storage ring as a platform for large-scale quantum computers and simulators: Challenges and directions for research and development

Author(s):  
T. Shaftan ◽  
Boris B. Blinov
2018 ◽  
Vol 189 (07) ◽  
pp. 721-738
Author(s):  
Leonid V. Grigorenko ◽  
Boris Yu. Sharkov ◽  
Andrei S. Fomichev ◽  
Aleksei L. Barabanov ◽  
V. Bart ◽  
...  

2021 ◽  
Vol 31 (5) ◽  
pp. 1-4
Author(s):  
Jay C. LeFebvre ◽  
Shane A. Cybart

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Prasanna Date ◽  
Davis Arthur ◽  
Lauren Pusey-Nazzaro

AbstractTraining machine learning models on classical computers is usually a time and compute intensive process. With Moore’s law nearing its inevitable end and an ever-increasing demand for large-scale data analysis using machine learning, we must leverage non-conventional computing paradigms like quantum computing to train machine learning models efficiently. Adiabatic quantum computers can approximately solve NP-hard problems, such as the quadratic unconstrained binary optimization (QUBO), faster than classical computers. Since many machine learning problems are also NP-hard, we believe adiabatic quantum computers might be instrumental in training machine learning models efficiently in the post Moore’s law era. In order to solve problems on adiabatic quantum computers, they must be formulated as QUBO problems, which is very challenging. In this paper, we formulate the training problems of three machine learning models—linear regression, support vector machine (SVM) and balanced k-means clustering—as QUBO problems, making them conducive to be trained on adiabatic quantum computers. We also analyze the computational complexities of our formulations and compare them to corresponding state-of-the-art classical approaches. We show that the time and space complexities of our formulations are better (in case of SVM and balanced k-means clustering) or equivalent (in case of linear regression) to their classical counterparts.


Author(s):  
Runmeng Qiao ◽  
Xin Wang ◽  
Guangjiong Qin ◽  
Jialei Liu ◽  
Aocheng Cao ◽  
...  

: The plastic film plays an important role in China's agricultural production. However, the large-scale use of plastic film has also produced a very serious problem of agricultural film pollution. Biodegradable polymers have attracted much attention because of the environmental pollution caused by traditional plastic mulching film. The most typical one is poly (butylene adipate co butylene terephthalate, PBAT). Poly (Butylene Adipate-co-Terephthalate) (PBAT) is a kind of aliphatic–aromatic polyesters with excellent biodegradability and mechanical processing properties. Therefore, it has been rapidly developed and widely used in the industry. However, there are clear requirements for the degradation period of agricultural film. At present, the degradable materials available on the market are difficult to meet the requirements of all crops for their degradation period. In this paper, the basic properties,degradation process and ways to delay the degradation of PBAT are reviewed to improve the degradation period of plastic film prepared by using this kind of material. Among them, the degradation process includes photodegradation, biodegradation and hydrolysis. The ways to delay the degradation include adding chain extender, light stabilizer, anti-hydrolysis agent and antibacterial agent. These can provide a theoretical basis for the research and development of biodegradable film with controllable degradation cycle. The future research and development of biodegradable polymers mainly focus on controllable degradation rate, stable degradation cycle, new materials and reducing research and development costs.


2013 ◽  
Vol 1530 ◽  
Author(s):  
A. Bendavid ◽  
L. Wieczorek ◽  
R. Chai ◽  
J. S. Cooper ◽  
B. Raguse

ABSTRACTA large area nanogap electrode fabrication method combinig conventional lithography patterning with the of focused ion beam (FIB) is presented. Lithography and a lift-off process were used to pattern 50 nm thick platinum pads having an area of 300 μm × 300 μm. A range of 30-300 nm wide nanogaps (length from 300 μm to 10 mm ) were then etched using an FIB of Ga+ at an acceleration voltage of 30 kV at various beam currents. An investigation of Ga+ beam current ranging between 1-50 pA was undertaken to optimise the process for the current fabrication method. In this study, we used Monte Carlo simulation to calculate the damage depth in various materials by the Ga+. Calculation of the recoil cascades of the substrate atoms are also presented. The nanogap electrodes fabricated in this study were found to have empty gap resistances exceeding several hundred MΩ. A comparison of the gap length versus electrical resistance on glass substrates is presented. The results thus outline some important issues in low-conductance measurements. The proposed nanogap fabrication method can be extended to various sensor applications, such as chemical sensing, that employ the nanogap platform. This method may be used as a prototype technique for large-scale fabrication due to its simple, fast and reliable features.


2001 ◽  
Vol 72 (11) ◽  
pp. 4300-4301 ◽  
Author(s):  
Stefan Rosén ◽  
Mats Larsson ◽  
Peder Royen ◽  
Danijela Rostohar ◽  
Johan Lidberg ◽  
...  

2019 ◽  
Vol 2 ◽  
pp. 111
Author(s):  
Jhoni Lagun Siang ◽  
Bahrudin Hasan ◽  
Lukman Tamhir

The purpose of this study is to: (1) produce video lessons that are feasible to be applied as learning media. (2) knowing the feasibility of learning videos so that they are feasible to be applied to learning media. Development of this learning video uses research and development methods or Research & Development which produces learning videos. This development research uses Allesi and Trollip method, which includes 3 steps of development, namely (1) planning: determining needs and goals, gathering resources, and generating ideas. (2) design: create flowcharts, create storyboards, and prepare scripts. (3) development: producing video and audio, programming material, preparing supporting components, evaluating and revising. The results of this development research are learning video products that have been tested for their feasibility by media experts, material experts, and students as users of the media. The overall results of the trial showed results, good namely obtaining a Worthy category with details: (1) the material expert test obtained an average yield of 3.55 which was categorized as feasible (2) the media expert test obtained an average yield of 3.5 which was categorized as feasible (3) scale test small by students get 3.5 average results which are categorized as feasible, (4) large-scale test by students get an average yield of 3.19 which is categorized as feasible. Based on the results of the media feasibility test, it can be concluded that the video is learning feasible to use.


2021 ◽  
Vol 1 ◽  
Author(s):  
Krzysztof Marecki ◽  
Agnieszka Wójcik-Czerniawska ◽  
Zbigniew Grzymała

The purpose of the article is to present the activities carried out by the Warsaw School of Economics, including the Department of Economics and Finance of the Local Government, aimed at both activities aimed at the diversified development of the broader sense - the activities of the Universities in this respect and in the strict sense, i.e. the activities of one of the departments, i.e. the Department of Economics and Finance of the Local Government within research and development at the local government level. The activities in the area of sustainable development include the membership to the Sustainable Development Goals Accord, the seat of the Polish branch of OIKOS International . On the other hand, activities in the field of sustainable development strictly mean activities in the field of research and development as well as conducting lectures and postgraduate studies in the field of sustainable development in the broad sense of the word. These activities are carried out by the mentioned department. The activities are therefore implemented on a large scale in order to increase the promotion of the idea of sustainable development in order to support the idea of sustainable development at every possible level, from national to local.


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