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Supercritical fluid technology as a sustainable alternative method for textile dyeing:An approach on waste,energy,and CO_(2)emission reduction

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Journal of Environmental Sciences 2024年第6期140卷 123-145页

作者： Carlos rafael Silva de oliveira Patrícia Viera de oliveira Leandro Pellenz Catia Rosana Lange de Aguiar Afonso Henrique da Silva Júnior Federal University of Santa Catarina Textile Engineering Department2514 João Pessoa St.BlumenauSC89036-004Brazil Federal University of Santa Catarina Chemical Engineering DepartmentS/n Biotério Central St.FlorianópolisSC88040-900Brazil

The clothing industry is considered one of the most polluting industries on the planet due to the high consumption of water,energy,chemicals/dyes,and high generation of solid waste and effluents.Faced with environmental concerns,the textile ennoblement sector is the most critical of the textile production chain,especially the traditional dyeing processes.As an alternative to current problems,dyeing with supercritical CO_(2)(scCO_(2))has been presented as a clean and efficient process for a sustainable textile future.Supercritical fluid dyeing(SFD)has shown a growing interest due to its significant impact on environmental preservation and social,economic,and financial gains.The main SFD benefits include economy and reuse of non-adsorbed dyes;reduction of process time and energy expenditure;capture of atmospheric CO_(2)(greenhouse gas);use and recycling of CO_(2)in SFD;generation of carbon credits;water-free process;effluent-free process;reduction of CO_(2)emission and auxiliary chemicals.despite being still a non-scalable and evolving technology,SFD is the future of dyeing.This review presented a comprehensive overview of the environmental impacts caused by traditional processes and confronted the advantages of SFD.The SFD technique was introduced,along with its latest advances and future perspectives.Financial and environmental gains were also discussed.

关键词： Textile industry Supercritical dyeing Sustainable processes Water free dyeing Energy saving Cleaner production

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Physico-chemical characterization of acid base disorders in patients with COVID-19: A cohort study

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World Journal of Nephrology 2024年第2期13卷 16-23页

作者： Sergio Pinto de Souza Juliana R Caldas Marcelo Barreto Lopes Marcelo Augusto Duarte Silveira Fernanda oliveira Coelho Igor oliveira Queiroz Pedro Domingues Cury Rogério da Hora Passos department of Nephrology Hospital São RafaelSalvadorBA 41253190Brazil department of Nephrology D’Or Institute for Research and Education(IDOR)SalvadorBA 41253190Brazil Faculty of Medicine Escola Bahiana de Medicina e Saúde Pública-EBMSPSalvadorBA 40290000Brazil department of Intensive Care D’Or Institute for Research and Education(IDOR)SalvadorBA 41253190Brazil Hospital São rafael D’Or Institute for Research and Education(IDOR)SalvadorBA 41253190Brazil department of Intensive Care Unit Hospital Israelita Albert EinsteinSao PauloSP 05652900Brazil

BACKGROUND Acid-base imbalance has been poorly described in patients with coronavirus disease 2019(COVID-19).Study by the quantitative acid-base approach may be able to account for minor changes in ion distribution that may have been over-looked using traditional acid-base analysis techniques.In a cohort of critically ill COVID-19 patients,we looked for an association between metabolic acidosis surrogates and worse clinical outcomes,such as mortality,renal dialysis,and length of hospital stay.AIM To describe the acid-base disorders of critically ill COVID-19 patients using Stewart’s approach,associating its variables with poor outcomes.METHODS This study pertained to a retrospective cohort comprised of adult patients who experienced an intensive care unit stay exceeding 4 days and who were diagnosed with severe acute respiratory syndrome coronavirus 2 infection through a positive polymerase chain reaction analysis of a nasal swab and typical pulmonary involvement observed in chest computed tomography scan.Laboratory and clinical data were obtained from electronic records.Categorical variables were compared using Fisher’s exact test.Continuous data were presented as median and interquartile range.The Mann-Whitney U test was used for comparisons.RESULTS In total,211 patients were analyzed.The mortality rate was 13.7%.Overall,149 patients(70.6%)presented with alkalosis,28 patients(13.3%)had acidosis,and the remaining 34 patients(16.2%)had a normal arterial pondus hydrogenii.Of those presenting with acidosis,most had a low apparent strong ion difference(SID)(20 patients,9.5%).Within the group with alkalosis,128 patients(61.0%)had respiratory origin.The non-survivors were older,had more comorbidities,and had higher Charlson’s and simplified acute physiology score 3.We did not find severe acid-base imbalance in this population.The analyzed Stewart’s variables(effective SID,apparent SID,and strong ion gap and the effect of albumin,lactate,phosphorus,and chloride)were not different between the groups.CONCLUSION Alkalemia

关键词： COVID-19 Physicochemical approach Acid-base status Critically ill patients Acute respiratory syndrome

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Fungal diversity notes 491–602: taxonomic and phylogenetic contributions to fungal taxa

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Fungal Diversity 2017年第2期83卷 1-261页

作者： Saowaluck Tibpromma Kevin D.Hyde Rajesh Jeewon Sajeewa S.N.Maharachchikumbura Jian-Kui Liu D.Jayarama Bhat E.B.Gareth Jones Eric H.C.McKenzie Erio Camporesi Timur S.Bulgakov Mingkwan Doilom AndreLuiz Cabral Monteiro de Azevedo Santiago Kanad Das Patinjareveettil Manimohan Tatiana B.Gibertoni Young Woon Lim Anusha Hasini Ekanayaka Benjarong Thongbai Hyang Burm Lee Jun-Bo Yang Paul M.Kirk Phongeun Sysouphanthong Sanjay K.Singh Saranyaphat Boonmee Wei Dong K.N.Anil Raj K.P.deepna Latha Rungtiwa Phookamsak Chayanard Phukhamsakda Sirinapa Konta Subashini C.Jayasiri Chada Norphanphoun Danushka S.Tennakoon Junfu Li Monika C.Dayarathne Rekhani H.Perera Yuanpin Xiao Dhanushka N.Wanasinghe Indunil C.Senanayake Ishani D.Goonasekara N.Ide Silva Ausana Mapook Ruvishika S.Jayawardena Asha J.Dissanayake Ishara S.Manawasinghe K.W.Thilini Chethana Zong-Long Luo Kalani Kanchana Hapuarachchi Abhishek Baghela Adriene Mayra Soares Alfredo Vizzini Angelina Meiras-Ottoni Armin Mesic Arun Kumar Dutta Carlos Alberto Fragoso de Souza Christian Richter Chuan-Gen Lin debasis Chakrabarty Dinushani A.Daranagama Diogo Xavier Lima Dyutiparna Chakraborty Enrico Ercole Fang Wu Giampaolo Simonini Gianrico Vasquez Gladstone Alves da Silva Helio Longoni Plautz Jr Hiran A.Ariyawansa Hyun Lee Ivana Kusan Jie Song Jingzu Sun Joydeep Karmakar Kaifeng Hu Kamal C.Semwal Kasun M.Thambugala Kerstin Voigt Krishnendu Acharya Kunhiraman C.Rajeshkumar Leif Ryvarden Margita Jadan MdIqbal Hosen Michal Miksık Milan C.Samarakoon Nalin N.Wijayawardene Nam Kyu Kim Neven Matocec Paras Nath Singh Qing Tian R.P.Bhatt rafael josevilela de oliveira Rodham E.Tulloss S.Aamir Saithong Kaewchai Sayali D.Marathe Sehroon Khan Sinang Hongsanan Sinchan Adhikari Tahir Mehmood Tapas Kumar Bandyopadhyay Tatyana YuSvetasheva Thi Thuong Thuong Nguyen Vladimır Antonın Wen-Jing Li Yong Wang Yuvraj Indoliya Zdenko Tkalcec Abdallah M.Elgorban Ali H.Bahkali Alvin M.C.Tang Hong-Yan Su Huang Zhang Itthayakorn Promputtha Jennifer Luangsa-ard Jianchu Xu Jiye Yan Kang Ji-Chuan Marc Stadler Pete Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of ScienceKunming 650201YunnanPeople’s Republic of China Center of Excellence in Fungal Research Mae Fah Luang UniversityChiang Rai 57100Thailand School of Science Mae Fah Luang UniversityChiang Rai 57100Thailand World Agroforestry Centre East and Central AsiaKunming 650201YunnanPeople’s Republic of China Mushroom Research Foundation 128 M.3 Ban Pa Deng T.Pa PaeA.Mae TaengChiang Mai 50150Thailand A.M.B.Gruppo Micologico Forlivese“Antonio Cicognani” Via Roma 18Forlı`Italy A.M.B.Circolo Micologico“Giovanni Carini” C.P.314BresciaItaly Societa`per gli Studi Naturalistici della Romagna C.P.144BagnacavalloRAItaly Formerly department of Botany Goa UniversityTaleigaoGoaIndia No.128/1-J Azad Housing SocietyCurcaGoa VelhaIndia 33 B St.Edwards Road Southsea Hants Hampshire PO53DHUK Landcare Research Manaaki Whenua Private Bag 92170AucklandNew Zealand department of Biology Faculty of ScienceChiang Mai UniversityChiang Mai 50200Thailand Division of Applied Science College of International EducationThe Hong Kong Baptist UniversityHong Kong SARChina PostGraduate Program in Biology of Fungi Department of MycologyFederal University of PernambucoAv.Nelson Chavess/nRecifePE 50670-420Brazil Institute of Plant and Environment Protection Beijing Academy of Agriculture and Forestry SciencesBeijing 100097People’s Republic of China Environmental Microbiology Lab Division of Food TechnologyBiotechnology&AgrochemistryCollege of Agriculture and Life SciencesChonnam National UniversityYongbong-Dong 300Buk-GuGwangju 61186Korea Guizhou Key Laboratory of Agricultural Biotechnology Guizhou Academy of Agricultural SciencesGuiyang 550006GuizhouPeople’s Republic of China College of Agriculture and Biological Sciences Dali UniversityDali 671003YunnanPeople’s Republic of China Yunnan Institute of Food Safety Kunming University of Science&TechnologyKunming 650500YunnanPeople’s Republic

This is a continuity of a series of taxonomic and phylogenetic papers on the fungi where materials were collected from many countries,examined and described.In addition to extensive morphological descriptions and appropriate asexual and sexual connections,DNA sequence data are also analysed from concatenated datasets to infer phylogenetic relationships and substantiate systematic positions of taxa within appropriate ranks.Wherever new species or combinations are proposed,we apply an integrative approach using morphological and molecular data as well as ecological features wherever applicable.Notes on 112 fungal taxa are compiled in this paper including Biatriosporaceae and Roussoellaceae,Didysimulans gen.nov.,81 new species,18 new host records and new country records,five reference specimens,two new combinations,and three sexual and asexual morph reports.The new species are Amanita cornelii,A.emodotrygon,Angustimassarina alni,A.arezzoensis,A.italica,A.lonicerae,A.premilcurensis,Ascochyta italica,A.rosae,Austroboletus appendiculatus,Barriopsis thailandica,Berkleasmium ariense,Calophoma petasitis,Camarosporium laburnicola,C.moricola,C.grisea,C.ossea,C.paraincrustata,Colletotrichum sambucicola,Coprinopsis cerkezii,Cytospora gelida,Dacrymyces chiangraiensis,Didysimulans italica,D.mezzanensis,Entodesmium italica,Entoloma magnum,Evlachovaea indica,Exophiala italica,Favolus gracilisporus,Femsjonia monospora,Fomitopsis flabellata,F.roseoalba,Gongronella brasiliensis,Helvella crispoides,Hermatomyces chiangmaiensis,H.chromolaenae,Hysterium centramurum,Inflatispora caryotae,Inocybe brunneosquamulosa,I.luteobrunnea,I.rubrobrunnea,Keissleriella cirsii,Lepiota cylindrocystidia,L.flavocarpa,L.maerimensis,Lophiotrema guttulata,Marasmius luculentus,Morenoina calamicola,Moelleriella thanathonensis,Mucor stercorarius,Myrmecridium fluviae,Myrothecium septentrionale,Neosetophoma garethjonesii,Nigrograna cangshanensis,Nodulosphaeria guttulatum,N.multiseptata,N.sambuci,Panus subfasciatus,Paraleptosphaeria padi,Paraphaeosphaeri

关键词： Agaricomycetes Ascomycota Basidiomycota Dacrymycetes Dothideomycetes Eurotiomycetes New combination Mucoromycotina New genus New records New species Pezizomycetes Phylogeny Sordariomycetes Taxonomy

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Retention of eucalyptus harvest residues reduces soil compaction caused by deep subsoiling

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Journal of Forestry Research 2022年第2期33卷 643-651页

作者： Raphael oliveira de Melo AymbiréAngeletti da Fonseca Nairam Félix de Barros Raphael Bragança Alves Fernandes rafael da Silva Teixeira Iago Nery Melo Ricardo Previdente Martins Soil Science department Universidade Federal de ViçosaViçosaMinas GeraisBrazil BRACELL Company AlagoinhasBahiaBrazil

Eucalyptus harvesting,forwarding and soil tillage operations are among the main causes for compaction of forest soils,with potential impacts on productivity.This concern is especially important in areas with soils that are naturally compacted(fragipans and duripans).In these soils,tillage operations include the use of subsoilers that can reach depths of more than one meter and require heavy tractors that exert high pressure on the soil.One of the ways to try to minimize the effect of this compaction is by retaining harvest residues.The objective of this study was to evaluate the impacts of eucalyptus harvesting on soil physical attributes,as well as to determine the potential of different types of residue management to reduce compaction from the soil tillage operation.Two experiments were conducted in the same area with a Yellow Argisol.In the first experiment,compaction caused by mechanized harvesting with harvester+forwarder was evaluated.In the second experiment,different managements of harvest residues were examined as potential modifiers of soil compaction during tillage for new plantings.For this,three managements systems were tested:(1)retention of all harvest residues and litter from the previous rotation(HR+L),(2)retention of litter from the previous rotation(L),and(3)removal of harvest residues and litter from the previous rotation(WR).Before and after harvest,sampling was carried out in the planting rows and inter-rows,and after tillage,samples were collected in the traffic line of the subsoiler-tractor set.In both experiments,undisturbed soil samples were collected from the center of the 0-10,10-20,20-40,40-60,and 60-100 cm layers to determine soil density and total porosity.In each period and site of evaluation,mechanical resistance to penetration up to the 60-cm depth was also determined.The harvesting operation increased soil density at 0-10 and 60-100 cm depths only in the inter-rows.Retention of harvest residues and litter(HR+L)after harvesting avoided increases in soil density and penetration re

关键词： Soil penetration resistance Harvester+forwarder Soil tillage Soil density Cohesive soils

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Multiple ecological strategies explain the distribution of exotic and native C_(4) grasses in heterogeneous early successional sites in Hawai’i

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Journal of Plant Ecology 2017年第3期10卷 426-439页

作者： rafael de oliveira Xavier Carla M.D’Antonio Ecology and Conservation Lab Department of HydrobiologyFederal University of São CarlosWashington Luís Highwaykm 235São CarlosSão Paulo 13565-905Brazil Environmental Studies Program 4312-L Bren University of CaliforniaSanta BarbaraCA 93106USA

Aims Biotic homogenization results in novel communities contain-ing multiple exotic species.Many attributes that contribute to the dominance of invaders and increase invasibility of communities have been identified,but rarely have factors governing the domi-nance of co-occurring invaders been considered.Here we assess the presence and performance of five exotic and one native C_(4) grass species across local(microsite)and more broad-scale variation in fire history,soil age,altitude and precipitation.We ask whether species show preferences for the same conditions,whether all are constrained by poor soil development,and how their performance changes when alone versus co-occurring.In addition to providing information useful to managers who want to control some of these species,such information can help to predict how distributions might change with climate change Methods We measured percent cover and plant height of each grass species in 64 plots in each of 15 sites,located in young volcanic substrates across environmental gradients in Hawai’i Volcanoes National Park,Hawai’i,USA.Sites varied in fire history and soil age,across altitu-dinal and precipitation gradients.We estimated microsite heteroge-neity by measuring rock cover and soil depth,where each species was present and in plots as a whole.We analyzed effects of pos-sible controlling variables using chi-square tests and Generalized Additive Mixed Models.Important Findings Two species(Schizachyrium condensatum and Hyparrhenia rufa)were absent in shallow soil,restricted to more mesic sites and showed increasing performance with soil depth.By contrast,two other species(Andropogon virginicus and Melinis repens)tended to occur in shal-low soil with high rock cover across a wide range of sites.One addi-tional species(Melinis minutiflora)was weakly affected by soil depth and was the dominant at higher elevation(more mesic)and on burned sites,especially in old soil.This species was largely absent from lower elevation sites,where the more widespread and opportunistic

关键词： elevation gradient fire invasive species Melinis minutiflora soil depth

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Protein profile of leprosy patients with plantar ulcers from the Eastern Amazon region

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Infectious Diseases of Poverty 2017年第1期6卷 947-954页

作者： Marineia Porto de oliveira Jorge Rodrigues de Sousa rafael Silva de Araujo Tinara Leila de Sousa Aarao Juarez Antonio Simoes Quaresma Nucleo de Medicina Tropical Universidade Federal do ParaAv.Generalissimo Deodoro 92UmarizalBelemPara 66055240Brazil Centro de Ciencias Biologicas e da Saude Universidade do Estado do ParaBelemParaBrazil

Background:Studies investigating the nutritional status of patients with leprosy and plantar ulcers are sparse.Therefore,the objective of this study was to describe the protein profile of leprosy patients with plantar ulcers from the Eastern Amazon region.Methods:A case record form was created for 75 patients with leprosy(31 with plantar ulcers and 44 without plantar ulcers)with the following data:sociodemographic characteristics,clinical form of leprosy,presence or absence of plantar ulcers,and nutritional assessment using anthropometry consisting of the measurement of body mass index,arm circumference,arm muscle circumference,and triceps skinfold.Levels of blood albumin,transferrin,and C-reactive protein(CRP)were also measured.Data regarding protein intake were obtained using a Food Frequency Questionnaire.Results:Plantar ulcers occurred more frequently in male patients(67.7%),patients aged 40-49 years(mean±SD:47.3±8.0 years),and patients receiving 300 or 600 USD(71.0%).The mean weight and height of patients were 71.6±11.4 kg and 1.62±0.1 m,respectively.High levels of CRP were detected in 51.6%of leprosy patients with plantar ulcers and only 9.1%of patients without plantar ulcers(Pdepletion of transferrin was observed in 14.3%of patients with paucibacillary leprosy and 44.3%of patients with multibacillary leprosy(P=0.0447).Most patients had normal levels of serum albumin(74.2%with plantar ulcers and 77.3%without plantar ulcers).Conclusions:Most leprosy patients with plantar ulcers have normal levels of serum albumin and transferrin and high CRP levels,which indicates the presence of an inflammatory process.Our findings suggest the need to monitor patients with leprosy to prevent the occurrence of plantar ulcers and to provide adequate treatment for patients with existing plantar ulcers.

关键词： Leprosy Plantar ulcer Nutritional status Anthropometric assessment Albumin Transferrin C-reactive protein

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Hepatobiliary & Pancreatic Diseases International 2012年第6期11卷 630-635页

作者： Rachid G Nagem Alcino Lázaro-da-Silva rafael Morroni de oliveira Valter Garcia Morato Division of General Surgery Ipsemg Hospital Belo Horizonte Brazil department of Surgery Federal University of Minas Gerais School of Medicine Belo Horizonte Brazil Division of General Surgery Ipsemg Hospital Belo Horizonte Brazil

BACKGROUND: Gastric bypass is a widespread bariatric procedure that carries a high incidence of gallstone formation postoperatively. Controversy exists regarding the importance and consequences of gallstones in these patients. There are surgeons who consider gallstone-related complications after gastric bypass important enough to require routine removal of the gallbladder during gastric bypass (prophylactic cholecystectomy). However, this can lead to increased costs and risks. This study aimed to identify complications related to cholelithiasis after Roux-en-Y gastric bypass (RYGBP). METHODS: This is a prospective observational study of 40 morbidly obese patients free of gallbladder disease. The patients underwent open RYGBP at a public hospital in Brazil from February to October 2007. They were followed up clinically and ultrasonographically at 6 months and 1, 2, and 3 years after surgery. Of the patients, 38 patients were followed up for 3 years. RESULTS: Eleven patients (28.9%) developed cholelithiasis, four (10.5%) experienced biliary pain, and 2 suffered from acute biliary pancreatitis (5.3%). These patients had their gallbladders removed laparoscopically. No patient presented with acute cholecystitis, choledocholithiasis, or bile duct dilation during the follow-up period. There were no deaths. CONCLUSIONS: Gallstone-related complications after RYGBP were relatively common. Some of these complications, like acute pancreatitis, are known to have potentially severe outcomes. It seems reasonable to perform cholecystectomy during gastric bypass in the presence of cholelithiasis or after this procedure if gallstones develop.

关键词： bariatric surgery cholecystectomy cholelithiasis gallstones obesity gastric bypass

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decontamination of mobile phones and electronic devices for health care professionals using a chlorhexidine/carbomer 940■gel

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Frontiers of Chemical Science and Engineering 2019年第1期13卷 192-198页

作者： rafael Muniz de oliveira Nereida Mello da Rosa Gioppo Jancineide oliveirade Carvalho Francilio Carvalho oliveira Thomas Jay Webster Fernanda Roberta Marciano Anderson oliveira Lobo University Hospital of the West of Parana State University of West of Parana Cascavel PR Brazil University Center for Health. Humanities and Technology of Piaui (UNINOVAFAPI). Piaui Brazil Science and Technology Institute Brasil University Itaquera SP Brazil Nanomedicine Laboratory Department of Chemical Engineering Northeastern University MA 02115 USA Materials Science and Engineering graduation program Technology Center Federal University of Piaui. PI Brazil

Though they reduce microorganism growth, current hospital disinfectants also damage many of today’s modern electronic devices such as tablets and smartphones. Herein, the efficacy of a new chlorhexidine digluconate gel (CDG) was tested as a disinfectant for mobile and electronic devices in a clinical environment. Specifically, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa and methicillin resistant Staphylococcus aureus were used to infect the screen of eight smartphones. The CDG was prepared at concentrations of 2%, 4% and 6%, and tested on paper disks infected with these bacteria before being tested on the smartphones. The devices were disinfected with the CDG gel (4%) at two times: immediately and after 5 min of the bacterial contamination. In all cases, the CDG gel eliminated 100% of gram-positive and gram-negative microorganisms compared to the control (without any agent). In addition, the gel did not damage the smartphones. Therefore, our study suggests that the CDG gel may be applied to disinfect a wide range of electronic devices for health care professionals in the hospital environment.

关键词： smartphones disinfection clinical environment chlorhexidine bacteria

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Inductive Model Generation for Text Classification Using a Bipartite Heterogeneous Network

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Journal of Computer Science & Technology 2014年第3期29卷 361-375页

作者： rafael Geraldeli Rossi Alneu de Andrade Lopes Thiago de Paulo Faleiros Solange oliveira Rezende Institute of Mathematics and Computer Science University of So PauloSo CarlosBrasil

Algorithms for numeric data classification have been applied for text classification. Usually the vector space model is used to represent text collections. The characteristics of this representation such as sparsity and high dimensionality sometimes impair the quality of general-purpose classifiers. Networks can be used to represent text collections, avoiding the high sparsity and allowing to model relationships among different objects that compose a text collection. Such network- based representations can improve the quality of the classification results. One of the simplest ways to represent textual collections by a network is through a bipartite heterogeneous network, which is composed of objects that represent the documents connected to objects that represent the terms. Heterogeneous bipartite networks do not require computation of similarities or relations among the objects and can be used to model any type of text collection. Due to the advantages of representing text collections through bipartite heterogeneous networks, in this article we present a text classifier which builds a classification model using the structure of a bipartite heterogeneous network. Such an algorithm, referred to as IMBHN （Inductive Model Based on Bipartite Heterogeneous Network）, induces a classification model assigning weights to objects that represent the terms for each class of the text collection. An empirical evaluation using a large amount of text collections from different domains shows that the proposed IMBHN algorithm produces significantly better results than k-NN, C4.5, SVM, and Naive Bayes algorithms.

关键词： heterogeneous network text classification inductive model generation

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Quantum Codes Do Not Increase Fidelity against Isotropic Errors

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Journal of Applied Mathematics and Physics 2023年第2期11卷 555-571页

作者： Jesús Lacalle Luis Miguel Pozo-Coronado André Luiz Fonseca de oliveira rafael Martín-Cuevas dep. de Matemática Aplicada a las TIC ETS de Ingeniería de Sistemas Informáticos Universidad Politécnica de Madrid C/Alan Turing s/n Madrid Spain Facultad de Ingeniería Universidad ORT Uruguay Montevideo Uruguay Programa de Doctorado en Ciencias y Tecnologías de la Computación para Smart Cities ETS de Ingeniería de Sistemas Informáticos Universidad Politécnica de Madrid C/Alan Turing s/n Madrid Spain

In this article, we study the ability of error-correcting quantum codes to increase the fidelity of quantum states throughout a quantum computation. We analyze arbitrary quantum codes that encode all qubits involved in the computation, and we study the evolution of n-qubit fidelity from the end of one application of the correcting circuit to the end of the next application. We assume that the correcting circuit does not introduce new errors, that it does not increase the execution time (i.e. its application takes zero seconds) and that quantum errors are isotropic. We show that the quantum code increases the fidelity of the states perturbed by quantum errors but that this improvement is not enough to justify the use of quantum codes. Namely, we prove that, taking into account that the time interval between the application of the two corrections is multiplied (at least) by the number of qubits n (due to the coding), the best option is not to use quantum codes, since the fidelity of the uncoded state over a time interval n times smaller is greater than that of the state resulting from the quantum code correction.

关键词： Quantum Error Correcting Codes Isotropic Quantum Computing Errors Quantum Computing Error Fidelity Quantum Computing Error Variance

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