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Cryogenic Optical Lattice Clock with Low 10−20 Blackbody Radiation Stark Uncertainty
Cryogenic Optical Lattice Clock with Low 10−20 Blackbody Radiation Stark Uncertainty
Cryogenic Optical Lattice Clock with Low 10−20 Blackbody Radiation Stark Uncertainty

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202103122
ISBN  
9798314899083
DDC  
539
저자명  
Hassan, Youssef S.
서명/저자  
Cryogenic Optical Lattice Clock with Low 10−20 Blackbody Radiation Stark Uncertainty
발행사항  
[Sl] : University of Colorado at Boulder, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
190 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
주기사항  
Advisor: Ludlow, Andrew.
학위논문주기  
Thesis (Ph.D.)--University of Colorado at Boulder, 2025.
초록/해제  
요약Controlling the Stark perturbation from ambient thermal radiation is key to advancing the performance of many atomic frequency standards. This thermal radiation perturbs the atomic energy levels, inducing a Stark shift to the clock frequency conventionally known as the BBR shift. For over four decades, the BBR shift has been a persistent challenge in the pursuit of better atomic clock performance. For room-temperature optical lattice clocks (OLCs) based on Yb and Sr, the BBR shift represents the largest uncanceled systematic frequency shift while typically also constituting the largest source of uncertainty in these state-of-the-art clocks at the ≈ 1 x 10−18 level. In this thesis, I report on the design, assembly and integration of a BBR enclosure, or "shield," that achieves an unprecedented BBR shift uncertainty of 1.7 x 10−20 by furnishing the interrogated atoms with a near-ideal BBR environment at a cryogenic temperature, while still allowing all the critical quantum control functions required for clock operation. Also, I present a novel lattice loading technique, known as ratchet loading, which enables programmable control over the spatial distribution of ultra-cold atoms confined in an optical lattice. This method allows for the loading of a large number of atoms, effectively reducing quantum projection noise (QPN) while also mitigating frequency shifts caused by atomic interactions. Additionally, ratchet loading facilitates the creation of spatially resolved atomic ensembles along the lattice, making it particularly useful for lattice light shift measurements and potentially advantageous for emerging techniques that probe atomic coherence beyond the local oscillator (LO) coherence time. With the near-elimination of blackbody radiation (BBR) uncertainty and improved clock stability for systematic evaluations, the realization of a mid- to low-10−19 uncertainty Yb optical lattice clock is now more attainable than ever.
일반주제명  
Atomic physics
일반주제명  
Materials science
일반주제명  
Theoretical physics
키워드  
Blackbody radiation
키워드  
Cryogenic shield
키워드  
Laser cooling
키워드  
Optical lattice clocks
키워드  
Ratchet loading
기타저자  
University of Colorado at Boulder Physics
기본자료저록  
Dissertations Abstracts International. 86-11B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■035    ▼a(MiAaPQ)AAI31938240
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a539
■1001  ▼aHassan,  Youssef  S.▼0(orcid)0000-0001-9539-8362
■24510▼aCryogenic  Optical  Lattice  Clock  with  Low  10−20  Blackbody  Radiation  Stark  Uncertainty
■260    ▼a[Sl]▼bUniversity  of  Colorado  at  Boulder▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a190  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-11,  Section:  B.
■500    ▼aAdvisor:  Ludlow,  Andrew.
■5021  ▼aThesis  (Ph.D.)--University  of  Colorado  at  Boulder,  2025.
■520    ▼aControlling  the  Stark  perturbation  from  ambient  thermal  radiation  is  key  to  advancing  the  performance  of  many  atomic  frequency  standards.  This  thermal  radiation  perturbs  the  atomic  energy  levels,  inducing  a  Stark  shift  to  the  clock  frequency  conventionally  known  as  the  BBR  shift.  For  over  four  decades,  the  BBR  shift  has  been  a  persistent  challenge  in  the  pursuit  of  better  atomic  clock  performance.  For  room-temperature  optical  lattice  clocks  (OLCs)  based  on  Yb  and  Sr,  the  BBR  shift  represents  the  largest  uncanceled  systematic  frequency  shift  while  typically  also  constituting  the  largest  source  of  uncertainty  in  these  state-of-the-art  clocks  at  the  ≈  1  x  10−18  level.  In  this  thesis,  I  report  on  the  design,  assembly  and  integration  of  a  BBR  enclosure,  or  "shield,"  that  achieves  an  unprecedented  BBR  shift  uncertainty  of  1.7  x  10−20  by  furnishing  the  interrogated  atoms  with  a  near-ideal  BBR  environment  at  a  cryogenic  temperature,  while  still  allowing  all  the  critical  quantum  control  functions  required  for  clock  operation.  Also,  I  present  a  novel  lattice  loading  technique,  known  as  ratchet  loading,  which  enables  programmable  control  over  the  spatial  distribution  of  ultra-cold  atoms  confined  in  an  optical  lattice.  This  method  allows  for  the  loading  of  a  large  number  of  atoms,  effectively  reducing  quantum  projection  noise  (QPN)  while  also  mitigating  frequency  shifts  caused  by  atomic  interactions.  Additionally,  ratchet  loading  facilitates  the  creation  of  spatially  resolved  atomic  ensembles  along  the  lattice,  making  it  particularly  useful  for  lattice  light  shift  measurements  and  potentially  advantageous  for  emerging  techniques  that  probe  atomic  coherence  beyond  the  local  oscillator  (LO)  coherence  time.  With  the  near-elimination  of  blackbody  radiation  (BBR)  uncertainty  and  improved  clock  stability  for  systematic  evaluations,  the  realization  of  a  mid-  to  low-10−19  uncertainty  Yb  optical  lattice  clock  is  now  more  attainable  than  ever.
■590    ▼aSchool  code:  0051.
■650  4▼aAtomic  physics
■650  4▼aMaterials  science
■650  4▼aTheoretical  physics
■653    ▼aBlackbody  radiation
■653    ▼aCryogenic  shield
■653    ▼aLaser  cooling
■653    ▼aOptical  lattice  clocks
■653    ▼aRatchet  loading
■690    ▼a0748
■690    ▼a0753
■690    ▼a0794
■71020▼aUniversity  of  Colorado  at  Boulder▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-11B.
■790    ▼a0051
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357049▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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