Leo Kouwenhoven

Leo Kouwenhoven
Leo Kouwenhoven in 2016
Born (1963-12-10) 10 December 1963 (age 61)
Pijnacker, Netherlands
Alma materTU Delft
AwardsSpinoza Prize (2007)
Scientific career
FieldsPhysics
Quantum computing
InstitutionsTU Delft
Websitequtech.nl/lab/kouwenhoven-lab/

Leo Kouwenhoven (born (1963-12-10)10 December 1963) is a Dutch physicist known for his research on quantum computing, specifically in topological quantum computing experiments.

Kouwenhoven grew up in Pijnacker, a village near Delft, where his parents ran a farm. After losing the admission lottery for veterinary medicine he decided to study physics at Delft University of Technology (TU Delft).[1]

In 1992 he received his PhD cum laude at TU Delft; his promoter was Hans Mooij [de]. In 1999 he became a professor at TU Delft.[1] In 2007 he received the Spinoza Prize, the highest Dutch academic award. In April 2012 his TU Delft research group presented experimental results that provided potential "signatures" of Majorana fermion quasiparticles.[2][3][4] These Majorana quasiparticles would be very stable, and therefore suitable for building a quantum computer.[5]

In 2018 his research group claimed to have proved the definitive existence of Majorana particles in a Nature publication.[6] However, the results could not be reproduced by other scientists, and the article had to be retracted in 2021 due to "insufficient scientific rigour".[7] [8][9][10] The researchers had excluded data points that contradicted their claims, with the complete data not supporting their conclusions.[11]

Two of the Majorana research papers involving Leo Kouwenhoven's group at QuTech were retracted due to data irregularities, leading to a couple of investigations by the TU Delft's Research Integrity Committee (CWI) and the Dutch Body for Scientific Integrity (LOWI) between 2020 and 2023.[a] While Kouwenhoven was found partly negligent in one case, no scientific integrity violations were confirmed.[12]

Kouwenhoven was reappointed as university professor at TU Delft in 2024.[12]

Personal life

Kouwenhoven has six sisters and is married to Vrije Universiteit Amsterdam professor Marleen Huysman.[1]

Notes

  1. ^ CWI and the LOWI led a first investigation between 2020 and 2022. The CWI conducted a second investigation from 2022 to 2023

References

  1. ^ a b c Hoeks, Louis (6 March 2016). "'Op de boerderij leerde ik dat wegduiken geen optie is'". Financieele Dagblad.
  2. ^ Bob Yirka (13 April 2012). "Researchers find possible evidence of Majorana fermions". phys.org. Retrieved 28 May 2024.
  3. ^ "Nanowetenschappers vinden langgezocht Majorana-deeltje". engineersonline.nl (in Dutch). 17 February 1999. Retrieved 28 May 2024.
  4. ^ Mourik, V.; Zuo, K.; Frolov, S. M.; Plissard, S. R.; Bakkers, E. P. a. M.; Kouwenhoven, L. P. (25 May 2012). "Signatures of Majorana Fermions in Hybrid Superconductor-Semiconductor Nanowire Devices". Science. 336 (6084): 1003–1007. arXiv:1204.2792. Bibcode:2012Sci...336.1003M. doi:10.1126/science.1222360. ISSN 0036-8075. PMID 22499805. S2CID 18447180.
  5. ^ Robert F. Service, Physicists Discover New Type of Particle — Sort Of, ScienceNOW, 12 April 2012
  6. ^ Zhang, Hao; Liu, Chun-Xiao; Gazibegovic, Sasa; Xu, Di; Logan, John A.; Wang, Guanzhong; van Loo, Nick; Bommer, Jouri D. S.; de Moor, Michiel W. A.; Car, Diana; Op het Veld, Roy L. M. (2018). "RETRACTED ARTICLE: Quantized Majorana conductance". Nature. 556 (7699): 74–79. arXiv:1710.10701. doi:10.1038/nature26142. ISSN 1476-4687. PMID 29590094. S2CID 4613547. (Retracted, see doi:10.1038/s41586-021-03373-x, PMID 33686283,  Retraction Watch)
  7. ^ Zhang, Hao; Liu, Chun-Xiao; Gazibegovic, Sasa; Xu, Di; Logan, John A.; Wang, Guanzhong; Van Loo, Nick; Bommer, Jouri D. S.; De Moor, Michiel W. A.; Car, Diana; Op Het Veld, Roy L. M.; Van Veldhoven, Petrus J.; Koelling, Sebastian; Verheijen, Marcel A.; Pendharkar, Mihir; Pennachio, Daniel J.; Shojaei, Borzoyeh; Lee, Joon Sue; Palmstrøm, Chris J.; Bakkers, Erik P. A. M.; Das Sarma, S.; Kouwenhoven, Leo P. (2021). "Retraction Note: Quantized Majorana conductance". Nature. 591 (7851): E30. Bibcode:2021Natur.591E..30Z. doi:10.1038/s41586-021-03373-x. PMID 33686283. S2CID 232159790.
  8. ^ "Landmark article by QuTech researchers under scrutiny". Landmark article by QuTech researchers under scrutiny | TU Delta (in Dutch). 19 May 2020. Retrieved 8 March 2021.
  9. ^ Stan van Pelt (23 February 2021). "Hoe jonge onderzoekers het fundament wegsloegen onder de quantumdroom van een Delftse hoogleraar". de Volkskrant (in Dutch). Retrieved 8 March 2021.
  10. ^ Brouwer, Piet; Ensslin, Klaus; Goldhaber-Gordon, David; Lee, Patrick (2021). "Nature paper 'Quantized Majorana conductance', report from independent experts". Zenodo. doi:10.5281/zenodo.4545812. S2CID 244959752.
  11. ^ "Microsoft's Big Win in Quantum Computing Was an 'Error' After All". Wired.
  12. ^ a b "Timeline retracted Majorana papers". QuTech. Retrieved 23 October 2024.

Read other articles:

Ermesinda

Ermesinda dari Asturias, oleh Francisco Joaquín Gutiérrez de la Vega. 1854. (Museo del Prado, Madrid). Ermesinda (skt. 720 atau skt. 730 — ?) atau Ormisenda, Ermisenda, Ermesinde, Ermessenda) adalah permaisuri Kerajaan Asturias, sebagai istri Raja Alfonsu I dari Asturias (Alfonsu yang Katolik). Dia adalah putri Raja Pelayo dari Asturias dan ratunya, Gaudiosa. Chronicon Albeldense berbahasa Latin menyatakan bahwa Ermesinda adalah putri Pelagius, raja pertama Asturias, dan ratunya, Gau...

 

Wied (Fluss)

Wied Die Wied bei Roßbach Die Wied bei Roßbach Daten Gewässerkennzahl DE: 2716 Lage Westerwald (Naturraum) Oberwesterwald Dreifelder Weiherland Niederwesterwald Asbach-Altenkirchener Hochflächen Waldbreitbacher Wiedtal Mittelrheingebiet Mittelrheinisches Becken Neuwieder Beckenrand Neuwieder Rheintalweitung Deutschland Rheinland-Pfalz Flusssystem Rhein Abfluss über Rhein → Nordsee Quelle nördlich von Linden50° 36′ 16″ N...

 

Harbor–UCLA Medical Center

Hospital in California, United StatesHarbor–UCLA Medical CenterLos Angeles County Department of Health ServicesGeographyLocation1000 W Carson St., Torrance, Los Angeles County, California, United StatesOrganizationCare systemPublicFundingGovernment hospitalTypeTeachingAffiliated universityUniversity of California, Los AngelesServicesEmergency departmentLevel I trauma centerBeds570Public transit access   CarsonHistoryOpened1946LinksWebsitedhs.lacounty.gov/harborListsHospitals in Califor...

Kill Bill

Kill BillLogo Kill BillSutradaraQuentin TarantinoProduserLawrence BenderDitulis olehQuentin TarantinoBerdasarkanThe Brideby Q&UPemeranUma ThurmanDavid CarradineLucy LiuMichael MadsenDaryl HannahSonny ChibaVivica A. FoxGordon LiuJulie DreyfusChiaki KuriyamaMichael ParksPenata musikRZASinematograferRobert RichardsonPenyuntingSally MenkePerusahaanproduksiA Band ApartDistributorMiramax FilmsTanggal rilisMei 2003 (film tunggal)10 Oktober 2003 (Vol 1)16 April 2004 (Vol 2)Durasi247 menitAn...

 

Yazd

City in Yazd province, Iran For the administrative divisions, see Yazd province and Yazd County. For the village in Khuzestan province, see Yazd-e Now. City in IranYazd یزدKath, IsatisCity Top to bottom, left to right: Amir Chakhmaq Complex, Zoroastrian Fire Temple, Dowlatabad Garden, Jame Mosque, Markar Clock Tower, Moshir Caravansary [fa], Tomb of Sayyed Rukn ad-Din SealYazdCoordinates: 31°52′56″N 54°20′23″E / 31.88222°N 54.33972°E / 31.88...

 

Sutjipto (militer, lahir 1926)

Sutjipto Menteri PertanianMasa jabatan28 Juli 1966 – 10 Juni 1968PresidenSoehartoPendahuluFrans SedaPenggantiThoyib Hadiwidjaja Informasi pribadiLahir4 Desember 1926 (umur 97)Boyolali, Jawa TengahKarier militerPihak IndonesiaDinas/cabang TNI Angkatan DaratMasa dinas1957 – 1976Pangkat Mayor Jenderal TNISatuanKorps Kehakiman (CKH)Sunting kotak info • L • B Mayor Jenderal TNI (Purn.) Sutjipto merupakan seorang perwira tinggi, politikus, dan ...

Earthlife Africa

South African environmental organization Environmental movement in South Africa Organisations Earthlife Africa Cape Town Ecology Group Koeberg Alert Earthlife Africa GreenPeace Africa EThekwini ECOPEACE Endangered Wildlife Trust WESSA Groundwork South Africa Dolphin Action and Protection Group Conferences South African National Conference on Environment and Development World Summit on Sustainable Development COP17 vte Earthlife Africa is a South African environmental and anti-nuclear organisa...

 

Handsome-Handsome Kucing Garong

Handsome-Handsome Kucing GarongPoster resmiGenre Horor Supernatural Komedi Fantasi Drama PembuatTobali Putra ProductionDitulis olehTeam TobaliSutradara Sondang Pratama Boy Rano Reza Aditya (Ko-sutradara) Pemeran Miller Khan Olivia Jensen Tarra Budiman Penggubah lagu temaImanineLagu pembukaCeria — J-RocksLagu penutupCeria — J-RocksPenata musikMatthews SiahaanNegara asalIndonesiaBahasa asliBahasa IndonesiaJmlh. musim1Jmlh. episode16 (daftar episode)ProduksiProduser eksekutifUtojo Sut...

 

Universitas Ratu Samban

artikel ini perlu dirapikan agar memenuhi standar Wikipedia. Tidak ada alasan yang diberikan. Silakan kembangkan artikel ini semampu Anda. Merapikan artikel dapat dilakukan dengan wikifikasi atau membagi artikel ke paragraf-paragraf. Jika sudah dirapikan, silakan hapus templat ini. (Pelajari cara dan kapan saatnya untuk menghapus pesan templat ini) Didirikan22 Januari 2001RektorDr. Faisal Alhabib, S.Pd,.M.PdLokasiBengkulu UtaraNama julukanUNRASSitus webunras-bkl.ac.id// Universitas Ratu Samba...

Jack Gordon (entertainment manager)

American businessman, entertainment and manager For other people named Jack Gordon, see Jack Gordon (disambiguation). Jack GordonGordon in 1998BornJack Leon Gordon(1939-11-10)November 10, 1939Springfield, Illinois, U.S.DiedApril 19, 2005(2005-04-19) (aged 65)Scottsdale, Arizona, U.S.Resting placePalm Valley View Cemetery, Las Vegas, NevadaNationalityAmericanOther namesSamuel Isaac Gordon (1981–83)Clifford William Johnson (1983)OccupationsEntertainment managerbusinessmanYears ...

 

世界政區索引

此條目可能包含不适用或被曲解的引用资料，部分内容的准确性无法被证實。 (2023年1月5日)请协助校核其中的错误以改善这篇条目。详情请参见条目的讨论页。 各国相关 主題列表 索引 国内生产总值 石油储量 国防预算 武装部队（军事） 官方语言 人口統計 人口密度 生育率 出生率 死亡率 自杀率 谋杀率 失业率 储蓄率 识字率 出口额 进口额 煤产量 发电量 监禁率 死刑 国债 ...

 

Barry Seal

Untuk the Member of the European Parliament, lihat Barry Seal (politician). Barry SealLahirAdler Berriman Seal16 Juli 1939Baton Rouge, LouisianaMeninggal19 Febuari 1986 (umur 46)Baton Rouge, LouisianaSebab meninggalDitembakKebangsaanAmerika SerikatPekerjaanPilot, penyelundup narkobaGugatan kejahatanKonspirasi penyelundupan narkoba Adler Berriman Barry Seal (16 Juli 1939 – 19 Februari 1986) adalah mantan tentara, pilot TWA berkebangsaan Amerika Serikat. Namanya mengemuka k...

西遊記大結局之仙履奇緣

本條目存在以下問題，請協助改善本條目或在討論頁針對議題發表看法。 此條目需要編修，以確保文法、用詞、语气、格式、標點等使用恰当。 (2013年8月6日)請按照校對指引，幫助编辑這個條目。（幫助、討論） 此條目剧情、虛構用語或人物介紹过长过细，需清理无关故事主轴的细节、用語和角色介紹。 (2020年10月6日)劇情、用語和人物介紹都只是用於了解故事主軸，輔助�...

 

Carroll Park

Park in Baltimore, Maryland, US For the park in New York City, see Carroll Gardens, Brooklyn. Carroll ParkMount Clare MansionTypePublic parkLocation1500 Washington BoulevardBaltimore, MD 21230[1]Coordinates39°16′34″N 76°39′14″W / 39.276°N 76.654°W / 39.276; -76.654Area117 acresCreated1890Operated byCity of Baltimore Carroll Park is a nearly 117-acre (47 ha) public park located in the historic Washington Village-Pigtown neighborhood in sout...

 

Transformator

Transformator distribusi yang dipasang di tiang dengan belitan sekunder yang ditancapkan di tengah yang digunakan untuk menyediakan daya fase-split untuk layanan komersial perumahan dan ringan, yang di Amerika Utara biasanya diberi daya 120/240 V.[1] Transformator atau trafo (disebut juga pengubah arus) adalah peralatan listrik yang mengubah bentuk energi listrik menjadi suatu bentuk energi listrik yang lainnya. Nilai tegangan listrik yang dihasilkan oleh transformator ditentukan oleh...

1966 FA Cup final

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: 1966 FA Cup final – news · newspapers · books · scholar · JSTOR (February 2011) (Learn how and when to remove this message) Football match1966 FA Cup finalEvent1965–66 FA Cup Everton Sheffield Wednesday 3 2 Date14 May 1966VenueWembley Stadium, LondonRefereeJ...

 

Art Óg Mac Murchadha Caomhánach

King of Laighin (Leinster) 1375 to 1417 Art ÓgMac Murchadha, King of LaighinMacMurrough-Kavanagh ridingReign1375 – c. 1417PredecessorDonnchadh mac MuircheartaighSuccessorDonnchadh mac Airt MhóirBorn1357Diedc. December 1417Ferns, IrelandorNew Ross, IrelandBurialSt Mullin's, IrelandSpouseElizabeth le VeelIssueDonnchadh, Gerald (Gearalt), Diarmuid LamhdeargNamesArt Óg Mac Murchadha CaomhánachIrishArt mac Airt Mac Murchadha CaomhánachEnglishArt MacMurrough-KavanaghHouseMac Murchadha-Ca...

 

United Building & Construction Trades Council v. Mayor and Council of Camden

This article relies excessively on references to primary sources. Please improve this article by adding secondary or tertiary sources. Find sources: United Building & Construction Trades Council v. Mayor and Council of Camden – news · newspapers · books · scholar · JSTOR (August 2019) (Learn how and when to remove this message) 1984 United States Supreme Court caseUnited Building & Construction Trades Council v. Mayor and Council of CamdenSupr...

Biru (seri televisi)

Untuk kegunaan lain, lihat Biru (disambiguasi). BiruGenre Drama Fantasi SkenarioDonna RosamaynaSutradara Anto Agam Manish Sharma Pemeran Amanda Manopo Randy Martin Beby Natalie Meriam Bellina Yusuf Surya Penggubah lagu temaRandy MartinLagu pembukaBagai Pelangi di Langit Biru — Randy MartinLagu penutupBagai Pelangi di Langit Biru — Randy MartinNegara asalIndonesiaBahasa asliBahasa IndonesiaJmlh. episode28 (daftar episode)ProduksiProduser Dhamoo Punjabi Manoj Punjabi Pengaturan kameraMulti-...

 

Sakramentale

Die Fußwaschung (Meister des Hausbuches, linker Flügel des Passionsaltars, um 1475) Sakramentalien (von lateinisch [signa] sacramentalia; Einzahl Sakramentale, lateinisch [signum] sacramentale ‚sakramentales Zeichen‘) sind nach römisch-katholischem Verständnis heilige Zeichen, rituell-symbolische Handlungen und Zeremonien, die in gewisser Nachahmung der Sakramente geistliche Wirkungen (zum übernatürlichen Nutzen der daran Glaubenden) bezeichnen und durch die Fürbitte der Kirche erl...