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Computational Complexity and Quantum Gibbs Sampling for Local Hamiltonians
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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■035    ▼a(MiAaPQ)Caltech17250
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■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.

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