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Simulating Dynamics of Quantum Information in Strongly Correlated Electron Systems
Simulating Dynamics of Quantum Information in Strongly Correlated Electron Systems
Simulating Dynamics of Quantum Information in Strongly Correlated Electron Systems

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자료유형  
 학위논문 서양
최종처리일시  
20260202103202
ISBN  
9798283137674
DDC  
530
저자명  
Gyawali, Gaurav.
서명/저자  
Simulating Dynamics of Quantum Information in Strongly Correlated Electron Systems
발행사항  
[Sl] : Cornell University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
235 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Lawler, Michael.
학위논문주기  
Thesis (Ph.D.)--Cornell University, 2025.
초록/해제  
요약Recent advances in probing and controlling quantum systems have brought us closer to Feynman's vision of simulating nature using quantum mechanics. Quantum processors promise efficient simulation of strongly correlated electrons, which suffer from the exponential scaling of classical simulation resources. Additionally, quantum processors provide access to quantum information properties that are not easily accessible in conventional condensed matter experiments. In this dissertation, I explore three distinct approaches to studying the dynamics of quantum information in the context of many-body physics simulations.First, I present an information theoretic study of the dynamics of monitored variational circuits that prepare the ground states of strongly correlated Hamiltonians (Chapter 3). Viewing the optimization as a communication problem reveals "coding barren plateaus", where a finite communication rate can be achieved between the sender and the receiver despite vanishing gradients. In a parallel study (Chapter 4), I present an adaptive variational algorithm to prepare the eigenstates of the Fermi-Hubbard model by building entanglement one gate at a time. This approach results in shallower circuits and circumvents barren plateaus, potentially enabling more efficient ground state preparation on near-term devices.Second, I focus on quantum information dynamics in strongly correlated electron systems, both clean and disordered. I present a real-device implementation for efficient disorder averaging, one of the central challenges in the computational study of many-body localization due to rare events, by leveraging quantum parallelism (Chapter 5). I examine the signature of localization in the dynamics of the second Renyi ´ entropy, which can be extended to measure mutual information and detect rare events to determine the stability of the many-body localization phase. I also explore learning thermodynamics from the simulation of quantum dynamics by employing diffusion maps-an unsupervised machine learning method-to uncover the quantum phase diagram of the transverse field Ising model and map entropy across the phase diagram with only 500 shots per data point (Chapter 6). I do so by developing time average classical shadows (TACS), an efficient classical representation of the microcanonical ensemble. Additionally, I discuss a novel shadow tomographic technique called the valence bond shadows that offers intuitive and efficient method to estimate observables of quantum spin liquids prepared on quantum processors (Chapter 7).Third, simulating long-time dynamics of strongly correlated electrons on quantum processors will likely require fault-tolerant quantum computing using error-correcting codes. By studying the channel capacity of realistic quantum device models, I find emergent coding phases tailored to specific noise characteristics (Chapter 8). Carrying out this approach on current noisy devices could provide a systematic way to construct quantum codes for robust computation and communication.Although access to quantum information properties is challenging using conventional analytical and numerical methods, the same challenge provides a promising path to quantum advantage in near-term devices. My studies highlight the potential of near-term quantum simulations to deepen our understanding of strongly correlated electrons by enabling the direct probing of quantum information-theoretic quantities in their dynamics.
일반주제명  
Physics
일반주제명  
Condensed matter physics
일반주제명  
Quantum physics
일반주제명  
Computational physics
키워드  
Disorder-free localization
키워드  
Emergent coding phases
키워드  
Quantum computing
키워드  
Quantum information theory
키워드  
Quantum simulations
키워드  
Strongly correlated electrons
기타저자  
Cornell University Physics
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
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MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aGyawali,  Gaurav.▼0(orcid)0000-0002-9226-7890
■24510▼aSimulating  Dynamics  of  Quantum  Information  in  Strongly  Correlated  Electron  Systems
■260    ▼a[Sl]▼bCornell  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a235  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Lawler,  Michael.
■5021  ▼aThesis  (Ph.D.)--Cornell  University,  2025.
■520    ▼aRecent  advances  in  probing  and  controlling  quantum  systems  have  brought  us  closer  to  Feynman's  vision  of  simulating  nature  using  quantum  mechanics.  Quantum  processors  promise  efficient  simulation  of  strongly  correlated  electrons,  which  suffer  from  the  exponential  scaling  of  classical  simulation  resources.  Additionally,  quantum  processors  provide  access  to  quantum  information  properties  that  are  not  easily  accessible  in  conventional  condensed  matter  experiments.  In  this  dissertation,  I  explore  three  distinct  approaches  to  studying  the  dynamics  of  quantum  information  in  the  context  of  many-body  physics  simulations.First,  I  present  an  information  theoretic  study  of  the  dynamics  of  monitored  variational  circuits  that  prepare  the  ground  states  of  strongly  correlated  Hamiltonians  (Chapter  3).  Viewing  the  optimization  as  a  communication  problem  reveals  "coding  barren  plateaus",  where  a  finite  communication  rate  can  be  achieved  between  the  sender  and  the  receiver  despite  vanishing  gradients.  In  a  parallel  study  (Chapter  4),  I  present  an  adaptive  variational  algorithm  to  prepare  the  eigenstates  of  the  Fermi-Hubbard  model  by  building  entanglement  one  gate  at  a  time.  This  approach  results  in  shallower  circuits  and  circumvents  barren  plateaus,  potentially  enabling  more  efficient  ground  state  preparation  on  near-term  devices.Second,  I  focus  on  quantum  information  dynamics  in  strongly  correlated  electron  systems,  both  clean  and  disordered.  I  present  a  real-device  implementation  for  efficient  disorder  averaging,  one  of  the  central  challenges  in  the  computational  study  of  many-body  localization  due  to  rare  events,  by  leveraging  quantum  parallelism  (Chapter  5).  I  examine  the  signature  of  localization  in  the  dynamics  of  the  second  Renyi  ´  entropy,  which  can  be  extended  to  measure  mutual  information  and  detect  rare  events  to  determine  the  stability  of  the  many-body  localization  phase.  I  also  explore  learning  thermodynamics  from  the  simulation  of  quantum  dynamics  by  employing  diffusion  maps-an  unsupervised  machine  learning  method-to  uncover  the  quantum  phase  diagram  of  the  transverse  field  Ising  model  and  map  entropy  across  the  phase  diagram  with  only  500  shots  per  data  point  (Chapter  6).  I  do  so  by  developing  time  average  classical  shadows  (TACS),  an  efficient  classical  representation  of  the  microcanonical  ensemble.  Additionally,  I  discuss  a  novel  shadow  tomographic  technique  called  the  valence  bond  shadows  that  offers  intuitive  and  efficient  method  to  estimate  observables  of  quantum  spin  liquids  prepared  on  quantum  processors  (Chapter  7).Third,  simulating  long-time  dynamics  of  strongly  correlated  electrons  on  quantum  processors  will  likely  require  fault-tolerant  quantum  computing  using  error-correcting  codes.  By  studying  the  channel  capacity  of  realistic  quantum  device  models,  I  find  emergent  coding  phases  tailored  to  specific  noise  characteristics  (Chapter  8).  Carrying  out  this  approach  on  current  noisy  devices  could  provide  a  systematic  way  to  construct  quantum  codes  for  robust  computation  and  communication.Although  access  to  quantum  information  properties  is  challenging  using  conventional  analytical  and  numerical  methods,  the  same  challenge  provides  a  promising  path  to  quantum  advantage  in  near-term  devices.  My  studies  highlight  the  potential  of  near-term  quantum  simulations  to  deepen  our  understanding  of  strongly  correlated  electrons  by  enabling  the  direct  probing  of  quantum  information-theoretic  quantities  in  their  dynamics.
■590    ▼aSchool  code:  0058.
■650  4▼aPhysics
■650  4▼aCondensed  matter  physics
■650  4▼aQuantum  physics
■650  4▼aComputational  physics
■653    ▼aDisorder-free  localization
■653    ▼aEmergent  coding  phases
■653    ▼aQuantum  computing
■653    ▼aQuantum  information  theory
■653    ▼aQuantum  simulations
■653    ▼aStrongly  correlated  electrons
■690    ▼a0605
■690    ▼a0599
■690    ▼a0611
■690    ▼a0216
■71020▼aCornell  University▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0058
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357288▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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