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Computational Complexity and Quantum Gibbs Sampling for Local Hamiltonians
Computational Complexity and Quantum Gibbs Sampling for Local Hamiltonians
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104750
- ISBN
- 9798290653679
- DDC
- 004
- 저자명
- Jiang, Jiaqing.
- 서명/저자
- Computational Complexity and Quantum Gibbs Sampling for Local Hamiltonians
- 발행사항
- [Sl] : California Institute of Technology, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 300 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
- 주기사항
- Advisor: Vidick, Thomas;Mahadev, Urmila;Preskill, John.
- 학위논문주기
- Thesis (Ph.D.)--California Institute of Technology, 2025.
- 초록/해제
- 요약One of the primary motivations for building quantum computers is to simulate quantum many-body systems. While significant progress has been made in simulating quantum dynamics, much less is known about simulating ground states and Gibbs states, an essential task for understanding the static properties of quantum many-body systems. From a computer science perspective, problems on ground states and Gibbs states are quantum analogues of the Boolean satisfiability problem (SAT) and classical Gibbs sampling, which have wide applications in optimization, machine learning, and computational complexity.This thesis leverages tools from computer science to explore the potential quantum advantage in simulating ground states and Gibbs states, through two complementary approaches: designing new quantum algorithms and evaluating the extent to which classical algorithms remain effective. In particular,• Quantum Gibbs sampling.In the first part, we describe our progress in developing quantum algorithms for preparing quantum Gibbs states. For general Hamiltonians, we develop a quantum analogue of the MetropolisHastings algorithm that is both conceptually simple and provably correct, with the Gibbs state as its approximate unique fixed point. Note that generalizing the Metropolis-Hasting algorithm to the quantum setting is non-trivial due to the unclonability of quantum states. Additionally, for a broad class of commuting Hamiltonians, we propose a different approach which constructs efficient quantum Gibbs samplers by leveraging reductions to existing classical sampling algorithms.• Sharpening the understanding of classical algorithms.In the second part, we present new complexity results to deepen our understanding of the capabilities of classical algorithms for ground energy estimation. The potential quantum advantage in solving many-body systems stems from the sign problem in general Hamiltonians, which classical algorithms struggle to handle. We give rigorous evidence to show that under certain conditions, widely used classical methods, such as fixed-node Monte Carlo and tensor network contraction, may overcome this barrier and effectively resolve the sign problem.
- 일반주제명
- Quantum computing
- 일반주제명
- Commuting
- 일반주제명
- Computers
- 일반주제명
- Quantum physics
- 일반주제명
- Computer science
- 일반주제명
- Fourier transforms
- 일반주제명
- Boolean
- 일반주제명
- Chemistry
- 일반주제명
- Design
- 일반주제명
- Information processing
- 일반주제명
- Eigenvalues
- 일반주제명
- Energy
- 일반주제명
- Complexity theory
- 일반주제명
- Eigenvectors
- 기타저자
- California Institute of Technology Engineering and Applied Science
- 기본자료저록
- Dissertations Abstracts International. 87-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202104750
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■007cr#unu||||||||
■020 ▼a9798290653679
■035 ▼a(MiAaPQ)AAI32151329
■035 ▼a(MiAaPQ)Caltech17250
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a004
■1001 ▼aJiang, Jiaqing.
■24510▼aComputational Complexity and Quantum Gibbs Sampling for Local Hamiltonians
■260 ▼a[Sl]▼bCalifornia Institute of Technology▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a300 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-01, Section: B.
■500 ▼aAdvisor: Vidick, Thomas;Mahadev, Urmila;Preskill, John.
■5021 ▼aThesis (Ph.D.)--California Institute of Technology, 2025.
■520 ▼aOne of the primary motivations for building quantum computers is to simulate quantum many-body systems. While significant progress has been made in simulating quantum dynamics, much less is known about simulating ground states and Gibbs states, an essential task for understanding the static properties of quantum many-body systems. From a computer science perspective, problems on ground states and Gibbs states are quantum analogues of the Boolean satisfiability problem (SAT) and classical Gibbs sampling, which have wide applications in optimization, machine learning, and computational complexity.This thesis leverages tools from computer science to explore the potential quantum advantage in simulating ground states and Gibbs states, through two complementary approaches: designing new quantum algorithms and evaluating the extent to which classical algorithms remain effective. In particular,• Quantum Gibbs sampling.In the first part, we describe our progress in developing quantum algorithms for preparing quantum Gibbs states. For general Hamiltonians, we develop a quantum analogue of the MetropolisHastings algorithm that is both conceptually simple and provably correct, with the Gibbs state as its approximate unique fixed point. Note that generalizing the Metropolis-Hasting algorithm to the quantum setting is non-trivial due to the unclonability of quantum states. Additionally, for a broad class of commuting Hamiltonians, we propose a different approach which constructs efficient quantum Gibbs samplers by leveraging reductions to existing classical sampling algorithms.• Sharpening the understanding of classical algorithms.In the second part, we present new complexity results to deepen our understanding of the capabilities of classical algorithms for ground energy estimation. The potential quantum advantage in solving many-body systems stems from the sign problem in general Hamiltonians, which classical algorithms struggle to handle. We give rigorous evidence to show that under certain conditions, widely used classical methods, such as fixed-node Monte Carlo and tensor network contraction, may overcome this barrier and effectively resolve the sign problem.
■590 ▼aSchool code: 0037.
■650 4▼aQuantum computing
■650 4▼aCommuting
■650 4▼aComputers
■650 4▼aQuantum physics
■650 4▼aComputer science
■650 4▼aFourier transforms
■650 4▼aBoolean
■650 4▼aChemistry
■650 4▼aDesign
■650 4▼aInformation processing
■650 4▼aEigenvalues
■650 4▼aEnergy
■650 4▼aComplexity theory
■650 4▼aEigenvectors
■690 ▼a0485
■690 ▼a0791
■690 ▼a0389
■690 ▼a0599
■690 ▼a0984
■71020▼aCalifornia Institute of Technology▼bEngineering and Applied Science.
■7730 ▼tDissertations Abstracts International▼g87-01B.
■790 ▼a0037
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358776▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


