Revista Brasileira De Ensino De Fisica最新文献_第9页

Computação Quântica Adiabática: Do Teorema Adiabático ao Computador da D-Wave 绝热量子计算:从绝热定理到D波计算机

Revista Brasileira De Ensino De Fisica Pub Date : 2021-01-01 DOI: 10.1590/1806-9126-RBEF-2021-0049

Paulo J. P. Souza, Taysa M. Mendonça, E. V. B. D. Oliveira, C. J. Villas-Boas

{"title":"Computação Quântica Adiabática: Do Teorema Adiabático ao Computador da D-Wave","authors":"Paulo J. P. Souza, Taysa M. Mendonça, E. V. B. D. Oliveira, C. J. Villas-Boas","doi":"10.1590/1806-9126-RBEF-2021-0049","DOIUrl":"https://doi.org/10.1590/1806-9126-RBEF-2021-0049","url":null,"abstract":"Neste artigo descrevemos os fundamentos da computação quântica adiabática, que consiste na interpolação de diferentes Hamiltonianos, desde um Hamiltoniano inicial, com autoestados e autoenergias conhecidos, até um Hamiltoniano final, onde é codificada a solução de um dado problema. Em particular, discutimos o método do annealing quântico, que é utilizado pela empresa canadense D-Wave, pioneira nessa área. Primeiramente apresentamos uma das demonstrações do teorema adiabático quântico e de uma condição de adiabaticidade para evolução de sistemas quânticos. Para exemplificar, descrevemos a implementação do algoritmo de Grover via computação quântica adiabática, discutindo os impactos da escolha da forma de interpolação dos Hamiltonianos inicial e final na complexidade do algoritmo. Em seguida, mostramos um algoritmo para o problema do caixeiro viajante executável na plataforma da D-Wave. Por fim, apresentamos aspectos f́ısicos importantes da tecnologia dos computadores quânticos da D-Wave, expondo suas vantagens e desvantagens, além de descrever qualitativamente a engenharia de seu processador quântico. Palavras-chave: Computação quântica adiabática, Annealing quântico, empresa D-Wave.","PeriodicalId":49620,"journal":{"name":"Revista Brasileira De Ensino De Fisica","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82187944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Rotation induced in a coil moving in an electric field 在电场中运动的线圈所引起的旋转

Revista Brasileira De Ensino De Fisica Pub Date : 2021-01-01 DOI: 10.1590/1806-9126-RBEF-2021-0017

A. Feoli, A. L. Iannella, E. Benedetto

引用次数: 0

A física estatística da turbulência 湍流的统计物理学

Revista Brasileira De Ensino De Fisica Pub Date : 2021-01-01 DOI: 10.1590/1806-9126-RBEF-2020-0450

L. Moriconi, R. Pereira

引用次数: 0

Utilizando uma balança digital de baixo custo como densímetro e sua aplicação a sólidos e líquidos 使用低成本的数字天平作为密度计及其在固体和液体中的应用

Revista Brasileira De Ensino De Fisica Pub Date : 2021-01-01 DOI: 10.1590/1806-9126-rbef-2020-0364

W. R. Silva, Jakson M. Fonseca

引用次数: 0

Lei da reflexão, lei de Snell e efeito Goos-Hänchen: abordagem via modelo corpuscular da luz 反射定律、斯内尔定律和Goos- hanchen效应:光的微粒模型方法

Revista Brasileira De Ensino De Fisica Pub Date : 2021-01-01 DOI: 10.1590/1806-9126-RBEF-2020-0350

A. V. Andrade-Neto, Davy Dias Andrade

引用次数: 0

Seeing by proxy: a detailed analysis of an educational interaction at the telescope 代理观看:望远镜教育互动的详细分析

Revista Brasileira De Ensino De Fisica Pub Date : 2020-01-01 DOI: 10.1590/1806-9126-rbef-2019-0354

J. B. V. Marques, Andrew P. Carlin, Ricardo Moutinho

{"title":"Seeing by proxy: a detailed analysis of an educational interaction at the telescope","authors":"J. B. V. Marques, Andrew P. Carlin, Ricardo Moutinho","doi":"10.1590/1806-9126-rbef-2019-0354","DOIUrl":"https://doi.org/10.1590/1806-9126-rbef-2019-0354","url":null,"abstract":"Astronomy education research is a growing field but the attention given to informal educational activities, such as telescope observations, museum visits or planetarium sessions, is still relatively scarce. In consequence, the area is poorly studied and understood. Addressing this gap, this present paper examines informal educational practices in an astronomical observatory through detailed analysis of a complete turn at the telescope by a small child, who is observing the Sun with the assistance of a guide. Using Ethnomethodology and Conversation Analysis this study investigates how this activity was produced in terms of structure and methods, the skills the participants have, and how the interaction between the visitor and the guide occurs. The study of these naturally occurring activities is done in-depth by the repeated inspection of video data, in order to identify the characteristics of the interaction, the organization of the talk and its implications as an educational event. The interactional nature of linguistic exchanges is highlighted; and the study of these activities reveals the practical methods used by guides and public. The present study contributes to our understanding of telescope observations as informal education activities; and shows the importance of research methods that are sensitive to naturally occurring events.","PeriodicalId":49620,"journal":{"name":"Revista Brasileira De Ensino De Fisica","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75199177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

O buraco negro e sua sombra 黑洞和它的影子

Revista Brasileira De Ensino De Fisica Pub Date : 2020-01-01 DOI: 10.1590/1806-9126-rbef-2020-0216

J. Neves

引用次数: 0

Proteção contra a radiação ultravioleta fornecida por óculos de sol 太阳镜提供的紫外线防护

Revista Brasileira De Ensino De Fisica Pub Date : 2020-01-01 DOI: 10.1590/1806-9126-rbef-2020-0144

Luis Peralta

引用次数: 0

A caveat about applications of the unilateral Fourier transform 关于单边傅里叶变换应用的警告

Revista Brasileira De Ensino De Fisica Pub Date : 2020-01-01 DOI: 10.1590/1806-9126-rbef-2020-0129

A. Castro

{"title":"A caveat about applications of the unilateral Fourier transform","authors":"A. Castro","doi":"10.1590/1806-9126-rbef-2020-0129","DOIUrl":"https://doi.org/10.1590/1806-9126-rbef-2020-0129","url":null,"abstract":"Integral transforms are used in a variety of applications, for example, to evaluate certain definite integrals, to transform a partial differential equation into an ordinary differential equation, to transform an ordinary differential equation into a simpler differential equation or into an algebraic equation, and they also can play a more theoretical role in applied problems. L. Debnath and D. Bhatta wrote in the Preface to the Second Edition of their book [1]: “When the first edition of this book was published in 1995 under the sole authorship of Lokenath Debnath, it was well received, and has been used as a senior undergraduate or graduate level text and research reference in the United States and abroad for the last ten years.” It is really a wellknown book, now in its third edition [2]. Unfortunately, it is a book marked by great carelessness concerning the unilateral Fourier transform and its applications which has apparently triggered the emergence of a number of papers [3][11] emulating the misuses found there. Truthfully, one of the cited papers not only emulates but expands the misguided applications [10]. The purpose of the present work it to call attention to the catastrophic embroilments mentioned above in order to keep students on alert. It is also a warning to reduce their own risk making future misleading research efforts. Even undergraduate students can follow the argument easily. The Fourier sine and cosine transforms of f (x) are denoted by Fs {f (x)} = Fs (k) and Fc {f (x)} = Fc (k), respectively, and are defined by the integrals (see, e.g. [12][13])","PeriodicalId":49620,"journal":{"name":"Revista Brasileira De Ensino De Fisica","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84206280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The normalization of wave functions of the continuous spectrum 连续谱波函数的归一化

Revista Brasileira De Ensino De Fisica Pub Date : 2020-01-01 DOI: 10.1590/1806-9126-rbef-2019-0099

M. Amaku, Francisco Antonio Bezerra Coutinho, F. M. Toyama

引用次数: 2