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請用此 Handle URI 來引用此文件: http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/101845
完整後設資料紀錄
DC 欄位值語言
dc.contributor.advisor高英哲zh_TW
dc.contributor.advisorYing-Jer Kaoen
dc.contributor.author洪浩迪zh_TW
dc.contributor.authorHao-Ti Hungen
dc.date.accessioned2026-03-05T16:07:07Z-
dc.date.available2026-03-06-
dc.date.copyright2026-03-05-
dc.date.issued2026-
dc.date.submitted2026-02-05-
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dc.identifier.urihttp://tdr.lib.ntu.edu.tw/jspui/handle/123456789/101845-
dc.description.abstract本論文探討了利用張量網路與量子電路來模擬量子多體系統以及求解偏微分方程(PDE)的方法。第一部分著重於在無限與有限長度格點的張量網路架構中使用時間依賴變分原理(Time-Dependent Variational Principle, TDVP)演算法,以研究自旋模型的動力學行為。我們透過將 Thirring 模型轉換為spin-lattice Hamiltonian,並進行複時間演化,探討其動態量子相變(Dynamical Quantum Phase Transitions, DQPTs)。本研究建立了 DQPT 與 Fisher 零點(Fisher zeros)之間的關聯。此外,我們利用有限系統的 TDVP 方法,在 XXZ 模型中進行 quantum quench 後的模擬,觀察到隨著實時間演化而出現的 coarsening 現象。
接著,本論文探討以極座標下的Quantic Tensor Train (QTT) 表示法求解二維偏微分方程。為處理 Laplacian 算符在原點處的 singularity,我們提出一種方法,使得所有相關運算皆可轉換為矩陣乘積算符(Matrix Product Operators, MPOs)的形式。此架構使得我們能夠利用 DMRG 及 TDVP 等演算法,模擬二維簡諧振子與 Gross–Pitaevskii(GP)方程的基態與動態行為。
最後一部分則研究量子電路方法在多體量子動力學中的應用,特別是 Ising 模型。我們利用受 TDVP 啟發的參數化量子電路進行無限長度 Ising 模型的虛時間演化,將矩陣乘積態(Matrix Product States, MPS)轉換為量子電路的表示,並於實際量子硬體上執行模擬。同時,我們 cost function 與期望值的分佈進行統計分析,並結合 quantum Lanczos 演算法以提升變分最佳化的效果。此外,我們模擬具縱向與橫向磁場的 Ising 模型之實時間演化,以探討其所呈現的 E_8 對稱性。為提升量子電路實作效率,我們亦應用基於張量網路的壓縮技術,優化電路深度,並於真實量子裝置上進行驗證。
綜合而言,本論文展示了張量網路與量子電路方法在模擬複雜量子系統與求解偏微分方程中的高效性與靈活性,為量子模擬的理論研究與實際應用開啟了新的方向。
zh_TW
dc.description.abstractThis dissertation explores methods for simulating quantum many-body systems and solving partial differential equations (PDEs) using tensor networks and quantum circuits. The first part focuses on the use of the Time-Dependent Variational Principle (TDVP) algorithm in both infinite- and finite-size lattice systems in tensor networks to study dynamical behavior in spin models. We investigate dynamical quantum phase transitions (DQPTs) in the Thirring and XXZ models by mapping the Thirring model to a spin-lattice Hamiltonian and performing complex-time evolution. A connection between Fisher zeros and DQPTs is established. In addition, we study the coarsening phenomenon in the XXZ model by applying finite-size TDVP following a quantum quench, revealing the emergence of coarsening behavior through real-time evolution.
Then, addresses the solution of two-dimensional partial differential equations using the Quantic Tensor Train (QTT) representation under polar coordinates. To manage the singularity at the origin of the Laplacian operator, we propose a regularization method that enables all relevant operations to be expressed as Matrix Product Operators (MPOs). This framework allows for ground state and dynamical simulations of the two-dimensional simple harmonic oscillator and the Gross–Pitaevskii (GP) equation using DMRG and TDVP algorithms.
The final part investigates quantum circuit approaches to many-body dynamics, with a particular focus on the Ising model. We perform imaginary-time evolution of the infinite-size Ising model using parameterized quantum circuits inspired by TDVP, converting Matrix Product States (MPS) into circuit representations and executing simulations on real quantum hardware. Statistical analysis of cost function distributions and expectation values is conducted, and a quantum Lanczos algorithm is used to improve variational optimization. Additionally, we simulate the real-time evolution of the transverse-field Ising model with a longitudinal field to explore signatures of emergent E_8 symmetry. Tensor network-based compression techniques are applied to optimize the depth of the quantum circuit, further enhancing the efficiency of the implementation on quantum devices.
Together, these studies demonstrate the effectiveness of tensor network and quantum circuit frameworks in simulating complex quantum systems and solving PDEs, paving the way for both theoretical advances and practical applications in quantum simulation.
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dc.description.tableofcontents口試委員會審定書i
誌謝iii
摘要vii
Abstract ix
List of Publications xiii
Table of Contents xv
List of Figures xix
List of Tables xxv
Chapter 1 Introduction 1
1.1 Motivation and Role of TDVP . . . . . . . . . . . . . . . . . . . . . 2
1.2 Overview of Dissertation Topics . . . . . . . . . . . . . . . . . . . . 4
Chapter 2 Dynamical Quantum Phase Transition of the Thirring and XXZ Models 7
2.1 Formalism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1.1 The Thirring Model as a Spin Model . . . . . . . . . . . . . . . . . 11
2.1.2 Matrix Product State . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.1.3 Penalty Term and Matrix Product Operator . . . . . . . . . . . . . . 14
2.1.4 Brief Introduction of VUMPS and TDVP . . . . . . . . . . . . . . 15
2.2 Equilibrium Phase Structure of the 1+1-dimensional Thirring Model 17
2.3 The Loschmidt Echo and the Mixed Transfer Matrix . . . . . . . . . 19
2.3.1 Quantum Quench and DQPT . . . . . . . . . . . . . . . . . . . . . 19
2.3.2 Investigation of DQPT in the Lattice Version of the Thirring Model . 23
2.3.3 DQPT and Thermalization . . . . . . . . . . . . . . . . . . . . . . 25
2.4 DQPTs and Finite-temperature Phase Diagram . . . . . . . . . . . . 26
2.4.1 Energy Threshold and the Inverse Temperature . . . . . . . . . . . . 26
2.5 DQPTs, Fisher Zeros, and the Effective-temperature–Time Plane . . . 35
2.5.1 Benchmark: Fisher Zeros and DQPTs In the XXZ Chain . . . . . . 35
2.5.2 Complex-time Evolution in the Thirring Model . . . . . . . . . . . 36
2.5.3 Analytic Fisher Zeros in the Transverse-field Ising Chain . . . . . . 39
2.6 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Chapter 3 Coarsening of the XXZ Model 45
3.1 Quench and Coarsening . . . . . . . . . . . . . . . . . . . . . . . . 45
3.2 Coarsening of the XXZ Model in a Quantum Quench . . . . . . . . . 48
3.3 Statistical Averaging over Random Longitudinal Fields . . . . . . . . 58
Chapter 4 Solving PED Using Quantics Tensor Train and TDVP 63
4.1 QTT Representation in Cartesian Coordinates . . . . . . . . . . . . . 64
4.2 Simulation Results in the Cartesian Coordinate . . . . . . . . . . . . 74
4.3 QTT Representation in Polar Coordinates . . . . . . . . . . . . . . . 80
4.4 Singularity at the Origin . . . . . . . . . . . . . . . . . . . . . . . . 85
4.5 MPO Representation in Polar Coordinates . . . . . . . . . . . . . . . 94
4.6 Simulation Results in Polar Coordinates . . . . . . . . . . . . . . . . 97
4.6.1 Heat Equation in Polar Coordinates . . . . . . . . . . . . . . . . . . 98
4.6.2 Schrödinger Equation in the Two-Dimensional Harmonic Oscillator 100
4.7 Rotating Gross–Pitaevskii Equation . . . . . . . . . . . . . . . . . . 105
4.7.1 Rotating Gross–Pitaevskii Equation in Polar Coordinates . . . . . . 105
4.7.2 Increasing the QTT Resolution by Adding Tensor Sites . . . . . . . 107
4.7.2.1 Nearest-Neighbor Interpolation . . . . . . . . . . . . . 108
4.7.2.2 Linear Interpolation . . . . . . . . . . . . . . . . . . . 109
4.7.2.3 Extension to Polar Coordinates . . . . . . . . . . . . . 109
4.7.2.4 Application: Refinement in the Rotating GP Simulation 110
4.7.3 Real-Time Dynamics After a Quantum Quench . . . . . . . . . . . 111
Chapter 5 Quantum Imaginary Time Evolution 115
5.1 The Concept of the TDVP Based on Quantum Circuits . . . . . . . . 118
5.1.1 The TDVP based on uMPS . . . . . . . . . . . . . . . . . . . . . . 118
5.1.2 Mapping between uMPS and Quantum Circuits . . . . . . . . . . . 123
5.1.3 Real-Time Evolution on 1D Infinite-size . . . . . . . . . . . . . . . 124
5.2 Expand Non-unitary to Unitary Gate . . . . . . . . . . . . . . . . . . 126
5.2.1 Expand Non-unitary to Unitary Gate Using SVD . . . . . . . . . . 126
5.2.2 The Construction of the Environment Gates . . . . . . . . . . . . . 127
5.2.3 Expansion of the Imaginary-time Evolution Operator . . . . . . . . 127
5.3 Quantum Imaginary-time Evolution for Infinite Systems . . . . . . . 128
5.3.1 Two Approaches to Deal with Non-unitary Operator . . . . . . . . . 129
5.3.2 Quantum Lanczos Algorithm . . . . . . . . . . . . . . . . . . . . . 133
5.4 Quantum Imaginary-time Evolution for Finite System . . . . . . . . . 135
5.5 Simulation Results . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
5.5.1 Results for 1D Infinite-size . . . . . . . . . . . . . . . . . . . . . . 138
5.5.2 Results for 1D Finite-size . . . . . . . . . . . . . . . . . . . . . . . 142
5.6 Statistical Effects of Quantum Measurements . . . . . . . . . . . . . 145
5.7 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
Chapter 6 𝐸8 Symmetry of the Ising Model:Using Quantum Circuits Simulation 155
6.1 𝐸8 Symmetry in Quantum Ising Model . . . . . . . . . . . . . . . . 157
6.2 Using IBMQ Quantum Real Device . . . . . . . . . . . . . . . . . . 163
6.2.1 Evolution Gate . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
6.2.2 Error Mitigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164
6.3 Riemannian Quantum Circuit Optimization . . . . . . . . . . . . . . 166
6.4 Masses in Frequency Domain . . . . . . . . . . . . . . . . . . . . . 171
6.5 Detail of Setting on Real Device . . . . . . . . . . . . . . . . . . . . 174
6.6 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
Chapter 7 Summary and Outlook 179
References 185
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dc.language.isoen-
dc.subject矩陣乘積態(MPS)-
dc.subjectDQPT-
dc.subjectThirring 模型-
dc.subjectCoarsening-
dc.subjectQTT-
dc.subject量子運算-
dc.subjectE8 對稱-
dc.subjectMPS-
dc.subjectDQPT-
dc.subjectThirring-
dc.subjectCoarsening-
dc.subjectQTT-
dc.subjectQuantum computing-
dc.subjectE8 Symmetry-
dc.title多體動力學在張量網路與量子電路中的計算zh_TW
dc.titleSimulation of Many-Body Dynamics with Tensor Networks and Quantum Circuitsen
dc.typeThesis-
dc.date.schoolyear114-1-
dc.description.degree博士-
dc.contributor.oralexamcommittee陳柏中;鍾佳民;林瑜琤;黃一平zh_TW
dc.contributor.oralexamcommitteePochung Chen;Chia-Min Chung;Yu-Cheng Lin;Yi-Ping Huangen
dc.subject.keyword矩陣乘積態(MPS); DQPT; Thirring 模型; Coarsening; QTT; 量子運算; E8 對稱zh_TW
dc.subject.keywordMPS; DQPT; Thirring; Coarsening; QTT; Quantum computing; E8 Symmetryen
dc.relation.page208-
dc.identifier.doi10.6342/NTU202600601-
dc.rights.note同意授權(全球公開)-
dc.date.accepted2026-02-08-
dc.contributor.author-college理學院-
dc.contributor.author-dept物理學系-
dc.date.embargo-lift2026-03-06-
顯示於系所單位:物理學系

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