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Confining Electrons on Helium in Quantum Dots
Confining Electrons on Helium in Quantum Dots
Confining Electrons on Helium in Quantum Dots

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자료유형  
 학위논문 서양
최종처리일시  
20250211152834
ISBN  
9798346759683
DDC  
530.1
저자명  
Feldman, Mayer Martin.
서명/저자  
Confining Electrons on Helium in Quantum Dots
발행사항  
[Sl] : Princeton University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
117 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-06, Section: B.
주기사항  
Advisor: Lyon, Stephen A.
학위논문주기  
Thesis (Ph.D.)--Princeton University, 2024.
초록/해제  
요약Quantum computing with electron spins requires the precise manipulation and detection of the electron charge state. Electrons on helium has lacked in this regard, opting to use deep channel, micron sized gates to address electrons while utilizing exotic methods for electron sensing. This thesis focuses on the feasibility of trapping and controlling electrons in submicron quantum dots, developing an all-electrical cryogenic amplifier circuit for electron sensing, transporting small packets of electrons over thin helium films, and measuring the spin degree of freedom of 109 spins over superfluid helium.The first portion of the thesis describes an experiment exploring the use of an array of 750,000 dual layer lithographically defined 200 nanometer quantum dots to trap electrons. We find that these quantum dots can support 10s of electrons but also acknowledge that a change in device structure needs to be made to allow for more experimental repeatability. In the end, this experiment highlighted the need to transition to thin film devices and more sensitive measurement techniques. The second portion of this thesis focuses on a novel device design that allows for a gentle transition between thick and thin helium films. The use of a smooth amorphous resistive metal allows us to drive electrons across the thin helium surface with reasonable voltages; and by integrating this with our take on a cryogenic amplifier circuit using High Electron Mobility Transistors, we can measure the mobilities of small packets of electrons. We find that these results are in good agreement with previous measurements of mobilities of many (106) electrons over bulk helium films at the temperatures we work in.The last portion of this thesis details our attempt to measure the spin coherence and lifetimes of electrons floating on helium using a 3D Cavity. The complexities associated with integrating these two wildly different systems together required a novel approach to sample motion at cryogenic temperatures. We detail the thought process and implementation of this new setup that preserves over 95% of 2 inches of room temperature motion at cryogenic temperatures.
일반주제명  
Quantum physics
일반주제명  
Condensed matter physics
일반주제명  
Electrical engineering
일반주제명  
Computational physics
키워드  
Electron spins
키워드  
Electrons on helium
키워드  
Quantum computing
키워드  
Quantum information
키워드  
High Electron Mobility Transistors
기타저자  
Princeton University Physics
기본자료저록  
Dissertations Abstracts International. 86-06B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798346759683
■035    ▼a(MiAaPQ)AAI31561186
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530.1
■1001  ▼aFeldman,  Mayer  Martin.▼0(orcid)0000-0002-8181-449X
■24510▼aConfining  Electrons  on  Helium  in  Quantum  Dots
■260    ▼a[Sl]▼bPrinceton  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a117  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-06,  Section:  B.
■500    ▼aAdvisor:  Lyon,  Stephen  A.
■5021  ▼aThesis  (Ph.D.)--Princeton  University,  2024.
■520    ▼aQuantum  computing  with  electron  spins  requires  the  precise  manipulation  and  detection  of  the  electron  charge  state.  Electrons  on  helium  has  lacked  in  this  regard,  opting  to  use  deep  channel,  micron  sized  gates  to  address  electrons  while  utilizing  exotic  methods  for  electron  sensing.  This  thesis  focuses  on  the  feasibility  of  trapping  and  controlling  electrons  in  submicron  quantum  dots,  developing  an  all-electrical  cryogenic  amplifier  circuit  for  electron  sensing,  transporting  small  packets  of  electrons  over  thin  helium  films,  and  measuring  the  spin  degree  of  freedom  of  109  spins  over  superfluid  helium.The  first  portion  of  the  thesis  describes  an  experiment  exploring  the  use  of  an  array  of  750,000  dual  layer  lithographically  defined  200  nanometer  quantum  dots  to  trap  electrons.  We  find  that  these  quantum  dots  can  support  10s  of  electrons  but  also  acknowledge  that  a  change  in  device  structure  needs  to  be  made  to  allow  for  more  experimental  repeatability.  In  the  end,  this  experiment  highlighted  the  need  to  transition  to  thin  film  devices  and  more  sensitive  measurement  techniques. The  second  portion  of  this  thesis  focuses  on  a  novel  device  design  that  allows  for  a  gentle  transition  between  thick  and  thin  helium  films.  The  use  of  a  smooth  amorphous  resistive  metal  allows  us  to  drive  electrons  across  the  thin  helium  surface  with  reasonable  voltages;  and  by  integrating  this  with  our  take  on  a  cryogenic  amplifier  circuit  using  High  Electron  Mobility  Transistors,  we  can  measure  the  mobilities  of  small  packets  of  electrons.  We  find  that  these  results  are  in  good  agreement  with  previous  measurements  of  mobilities  of  many  (106)  electrons  over  bulk  helium  films  at  the  temperatures  we  work  in.The  last  portion  of  this  thesis  details  our  attempt  to  measure  the  spin  coherence  and  lifetimes  of  electrons  floating  on  helium  using  a  3D  Cavity.  The  complexities  associated  with  integrating  these  two  wildly  different  systems  together  required  a  novel  approach  to  sample  motion  at  cryogenic  temperatures.  We  detail  the  thought  process  and  implementation  of  this  new  setup  that  preserves  over  95%  of  2  inches  of  room  temperature  motion  at  cryogenic  temperatures.
■590    ▼aSchool  code:  0181.
■650  4▼aQuantum  physics
■650  4▼aCondensed  matter  physics
■650  4▼aElectrical  engineering
■650  4▼aComputational  physics
■653    ▼aElectron  spins
■653    ▼aElectrons  on  helium
■653    ▼aQuantum  computing
■653    ▼aQuantum  information
■653    ▼aHigh  Electron  Mobility  Transistors
■690    ▼a0599
■690    ▼a0611
■690    ▼a0544
■690    ▼a0216
■71020▼aPrinceton  University▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-06B.
■790    ▼a0181
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164123▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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