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Ultracold Molecules in an Optical Tweezer Array: From Dipolar Interaction to Ground State Cooling
Ultracold Molecules in an Optical Tweezer Array: From Dipolar Interaction to Ground State ...
Ultracold Molecules in an Optical Tweezer Array: From Dipolar Interaction to Ground State Cooling

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20250211151445
ISBN  
9798382777450
DDC  
539
저자명  
Bao, Yicheng.
서명/저자  
Ultracold Molecules in an Optical Tweezer Array: From Dipolar Interaction to Ground State Cooling
발행사항  
[Sl] : Harvard University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
293 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Doyle, John.
학위논문주기  
Thesis (Ph.D.)--Harvard University, 2024.
초록/해제  
요약Ultracold molecules are attractive candidates for various applications including ultracold chemistry, quantum information processing, quantum simulation and searches for physics beyond the standard model. Combined with optical tweezer techniques, an optical tweezer array of ultracold polar molecules holds promise for versatile quantum applications. Their long‑lived molecular rotational states form robust qubits, while the long‑range dipolar interaction between molecules provides quantum entanglement.In this thesis, we build a new generation experiment of optical tweezer array of ultracold CaF molecules. We optically transport the laser cooled and optically trapped molecules into a science glass cell using a hybrid method, where high numerical aperture optical access allows for tighter optical tweezers. In an array of these tight optical tweezers, we demonstrate dipolar spin‑exchange interactions between single CaF molecules for the first time. We realize the spin‑ 1/2 quantum XY model by encoding an effective spin‑ 1/2 system into the rotational states of the molecules, and use it to generate a Bell state through an iSWAP operation. Conditioned on the verified existence of molecules in both tweezers at the end of the measurement, we obtain a Bell state fidelity of 0.89(6). Employing interleaved tweezer arrays, we demonstrate single site molecular addressability. To further improve the platform, cooling of the molecules to near the motional ground state is crucial for reducing various dephasings. We demonstrate Raman sideband cooling (RSC) of CaF molecules in optical tweezers to near their 3‑D motional ground state, with a 3‑D motional ground state probability of 54 ± 18% of the molecules that survive the RSC. This paves the way to increase molecular coherence times in optical tweezers for robust quantum information processing and simulation applications in the near future.
일반주제명  
Molecular physics
일반주제명  
Atomic physics
일반주제명  
Quantum physics
일반주제명  
Physics
키워드  
Dipolar interaction
키워드  
Quantum entanglement
키워드  
Laser cooling
키워드  
Optical transport
키워드  
Raman sideband cooling
키워드  
Ultracold molecules
기타저자  
Harvard University Physics
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

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■035    ▼a(MiAaPQ)AAI31296411
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a539
■1001  ▼aBao,  Yicheng.▼0(orcid)0000-0002-0955-8567
■24510▼aUltracold  Molecules  in  an  Optical  Tweezer  Array:  From  Dipolar  Interaction  to  Ground  State  Cooling
■260    ▼a[Sl]▼bHarvard  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a293  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Doyle,  John.
■5021  ▼aThesis  (Ph.D.)--Harvard  University,  2024.
■520    ▼aUltracold  molecules  are  attractive  candidates  for  various  applications  including  ultracold  chemistry,  quantum  information  processing,  quantum  simulation  and  searches  for  physics  beyond  the  standard  model.  Combined  with  optical  tweezer  techniques,  an  optical  tweezer  array  of  ultracold  polar  molecules  holds  promise  for  versatile  quantum  applications.  Their  long‑lived  molecular  rotational  states  form  robust  qubits,  while  the  long‑range  dipolar  interaction  between  molecules  provides  quantum  entanglement.In  this  thesis,  we  build  a  new  generation  experiment  of  optical  tweezer  array  of  ultracold  CaF  molecules.  We  optically  transport  the  laser  cooled  and  optically  trapped  molecules  into  a  science  glass  cell  using  a  hybrid  method,  where  high  numerical  aperture  optical  access  allows  for  tighter  optical  tweezers.  In  an  array  of  these  tight  optical  tweezers,  we  demonstrate  dipolar  spin‑exchange  interactions  between  single  CaF  molecules  for  the  first  time.  We  realize  the  spin‑  1/2  quantum  XY  model  by  encoding  an  effective  spin‑  1/2  system  into  the  rotational  states  of  the  molecules,  and  use  it  to  generate  a  Bell  state  through  an  iSWAP  operation.  Conditioned  on  the  verified  existence  of  molecules  in  both  tweezers  at  the  end  of  the  measurement,  we  obtain  a  Bell  state  fidelity  of  0.89(6).  Employing  interleaved  tweezer  arrays,  we  demonstrate  single  site  molecular  addressability.  To  further  improve  the  platform,  cooling  of  the  molecules  to  near  the  motional  ground  state  is  crucial  for  reducing  various  dephasings.  We  demonstrate  Raman  sideband  cooling  (RSC)  of  CaF  molecules  in  optical  tweezers  to  near  their  3‑D  motional  ground  state,  with  a  3‑D  motional  ground  state  probability  of  54  ±  18%  of  the  molecules  that  survive  the  RSC.  This  paves  the  way  to  increase  molecular  coherence  times  in  optical  tweezers  for  robust  quantum  information  processing  and  simulation  applications  in  the  near  future.
■590    ▼aSchool  code:  0084.
■650  4▼aMolecular  physics
■650  4▼aAtomic  physics
■650  4▼aQuantum  physics
■650  4▼aPhysics
■653    ▼aDipolar  interaction
■653    ▼aQuantum  entanglement
■653    ▼aLaser  cooling
■653    ▼aOptical  transport
■653    ▼aRaman  sideband  cooling
■653    ▼aUltracold  molecules
■690    ▼a0609
■690    ▼a0748
■690    ▼a0599
■690    ▼a0605
■71020▼aHarvard  University▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0084
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161788▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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