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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 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
- Laser cooling
- 기타저자
- Harvard University Physics
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211151445
■006m o d
■007cr#unu||||||||
■020 ▼a9798382777450
■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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