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Prof. Synge Todo (University of Tokyo)24/08/2026, 09:45
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Prof. Philippe Corboz (Univ. of Amsterdam)24/08/2026, 10:00Lecture / Invited Talk
Infinite projected entangled-pair states (iPEPS) provide a state-of-the-art tool for studying strongly correlated systems in two dimensions directly in the thermodynamic limit. In the first lecture, I give a basic introduction to iPEPS, including standard contraction and optimization methods. The second lecture covers advanced iPEPS techniques and recent developments, including accelerated...
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Prof. Philippe Corboz (Univ. of Amsterdam)24/08/2026, 11:20Lecture / Invited Talk
Infinite projected entangled-pair states (iPEPS) provide a state-of-the-art tool for studying strongly correlated systems in two dimensions directly in the thermodynamic limit. In the first lecture, I give a basic introduction to iPEPS, including standard contraction and optimization methods. The second lecture covers advanced iPEPS techniques and recent developments, including accelerated...
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Dr Atsushi Ueda (Ghent Univ.)24/08/2026, 14:00Lecture / Invited Talk
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Yuto Sugimoto (Tohoku University)24/08/2026, 15:00
We investigate the two-dimensional classical ANNNI model using the tensor renormalization group method. At finite next-nearest-neighbor interactions, the model is predicted to exhibit a critical phase known as the floating phase. In this study, we employ the bond-weighted tensor renormalization group method to investigate the floating phase. Using bond dimensions up to D=240, together with a...
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Kaito Wada (International Center for Elementary Particle Physics, The University of Tokyo)24/08/2026, 15:20
Probing ground-state properties is central to understanding quantum matter, yet conventional approaches usually require many independently prepared copies. This becomes prohibitive when ground-state preparation is costly and only a limited number of copies are available. Here we introduce a coherent readout protocol that processes given $P$ ground-state copies in parallel using controlled...
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Prof. Hyun-Yong Lee (Korea Univ.)24/08/2026, 16:00Lecture / Invited Talk
Weak first-order transitions can exhibit extended pseudo-critical regimes that are notoriously difficult to distinguish from genuine criticality by conventional finite-size scaling. We show that the long-standing apparent criticality of the dilute Baxter—Wu model is instead a manifestation of an extremely slow renormalization-group flow due to a nearly marginal perturbation, ultimately leading...
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Prof. Seung-Sup Lee (Seoul National University)25/08/2026, 10:00Lecture / Invited Talk
Tensor network methods and quantum information science have enriched each other over the past few decades. In this talk, I will present two examples of this interplay from our recent works. First, in the direction of “tensor networks for quantum,” I will discuss the complexity of classically simulating a two-dimensional quantum sampling architecture in the presence of disorder. Using exact...
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Seishiro Ono (Institute for Solid State Physics, University of Tokyo)25/08/2026, 11:20
Accurate contraction of tensor networks beyond one dimension is essential in various fields including quantum many-body physics. However, existing approaches typically rely on approximate contraction schemes and do not provide certified error bars. In this talk, we introduce an alternative perspective on tensor-network contraction problems via the numerical bootstrap framework. This technique...
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Dr Donghoon Kim (RIKEN)25/08/2026, 11:40
Understanding the complexity of quantum many-body states requires control not only over entanglement entropy but also over the distribution of entanglement across the Schmidt spectrum. The Small-Incremental-Entangling (SIE) theorem provides a remarkably general bound on the rate of change of bipartite von Neumann entanglement entropy, yet leaves this finer spectral structure unresolved. In...
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Zhiyu Jiang (The University of Osaka)25/08/2026, 12:00
We introduce a gauge-propagation approach for approximately converting generic tensor-network states into an isometric tensor-network state form with a prescribed orthogonality center. In one dimension, this propagation is exact because the non-isometric factor produced by a QR or singular-value decomposition is supported on a single virtual bond. In higher-dimensional networks, however, a...
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142. Quantum resource in different perspectives and classically simulatable quantum many-body statesProf. Mingpu Qin (Shanghai Jiao Tong University)25/08/2026, 14:00Lecture / Invited Talk
I will begin by examining different perspectives on what constitutes a quantum resource, specifically focusing on definitions that distinguish quantum systems from classical ones based on the criterion of classical simulability. I will then demonstrate how integrating various classically simulatable ingredients can lead to the development of more powerful classical algorithms for simulating...
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Prof. Kouichi Okunishi (Department of Physics, Graduate School of Science, Osaka Metropolitan University)25/08/2026, 15:00
We discuss the angular-time evolution ---a parameter-time evolution generated by the entanglement Hamiltonian--- for the bipartitioned ground state of the S=1 bilinear–biquadratic chain under open boundary conditions. For the exactly sobvable AKLT chain, we first demonstrate the relationship between the angular-time evolution and edge-spin dynamics in a uniform magnetic field applied to the...
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Fengfeng Song (ISSP UTokyo)25/08/2026, 15:20
Genuine multipartite entanglement captures collective quantum correlations that cannot be described by convex mixtures of states separable across different bipartitions. Quantifying such correlations in quantum many-body states is essential for characterizing their irreducibly collective quantum structure and assessing their potential as multipartite quantum resources, yet remains...
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Prof. Dario Poletti (Singapore University of Technology and Design)25/08/2026, 16:00Lecture / Invited Talk
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Prof. Nobert Schuch (Univ. of Vienna)26/08/2026, 10:00Lecture / Invited Talk
These lectures will provide an introduction into the mathematical theory of tensor networks, covering in particular how tensor networks can be used to construct solvable quantum many-body models, and how symmetries can be encoded in tensor networks, leading to the realization of symmetry-protected, symmetry-enriched, and topological phases of matter. The second lecture will moreover cover some...
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Prof. Nobert Schuch (Univ. of Vienna)26/08/2026, 11:20Lecture / Invited Talk
These lectures will provide an introduction into the mathematical theory of tensor networks, covering in particular how tensor networks can be used to construct solvable quantum many-body models, and how symmetries can be encoded in tensor networks, leading to the realization of symmetry-protected, symmetry-enriched, and topological phases of matter. The second lecture will moreover cover some...
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Mizuki Hamada (Keio University)26/08/2026, 12:20Poster Presentation
Quantum error mitigation is a collection of techniques for reducing the effect of noise when estimating expectation values on noisy quantum computers. In particular, fully virtual purification (FVP) suppresses errors by preparing multiple copies of a noisy quantum state and cyclically permuting them, thereby amplifying the contribution of the dominant eigenstate that is least affected...
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Yuji Okochi (Keio University)26/08/2026, 12:20Poster Presentation
Long-range interacting quantum many-body systems have recently been realized in platforms such as trapped-ion systems and Rydberg atom arrays. In theoretical descriptions of long-range interactions, the Kac normalization factor is often introduced to keep the interaction energy per particle finite in the thermodynamic limit. In many models, however, this factor does not emerge naturally from...
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Yen Chou (NYCU)26/08/2026, 12:20Poster Presentation
This work applies a tensor-network space–time framework based on the Quantized Tensor Train (QTT) representation to the Gross–Pitaevskii equation (GPE), following the matrix-product-state space–time formulation introduced in Ref. [1]. The wavefunction is encoded as a Matrix Product State, while spatial differential operators, trapping potentials, temporal couplings, and nonlinear interaction...
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Ryoma Watanabe (ISSP, the University of Tokyo)26/08/2026, 12:20Poster Presentation
While the concept of the renormalization group (RG) is a highly powerful framework for the phase transitions, applying it analytically to specific systems is generally difficult. In recent years, the Tensor Renormalization Group (TRG), which utilizes Tensor Networks (TNs), has been developed as a method for performing RG calculations numerically with high precision. TRG can be easily executed...
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Yusuke Kajiwara (Faculty of Science, Shizuoka University)26/08/2026, 12:20Poster Presentation
In this work, we introduce additional dimer degrees of freedom into classical spin models and investigate their thermodynamic behavior using Monte Carlo simulations. The dimers represent locally correlated spin pairs and are dynamically created, annihilated, and rearranged together with classical spin configurations. This semiclassical approach allows us to study the interplay between magnetic...
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Yuya Seki (Keio University)26/08/2026, 12:20Poster Presentation
Adiabatic quantum computation is one approach to solving combinatorial optimization problems. In this talk, we propose a method that first transforms a combinatorial optimization problem into an equivalent continuous optimization problem via polyhedral domain decomposition and then performs adiabatic quantum computation. Since this formulation makes it easy to introduce quantum fluctuations...
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Haruki Saito (Department of Physics, Graduate School of Science, the University of Tokyo)26/08/2026, 12:20Poster Presentation
The dynamics of quantum many-body systems are strongly constrained by the conserved quantities and symmetries of their Hamiltonians. Conserved quantities play a fundamental role in phenomena such as thermalization/nonthermalization, transport, and integrability, while the commutation relations among conserved quantities are closely related to continuous symmetries and the underlying algebraic...
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Mr Jeong-Hyeok Cha (Seoul National University)26/08/2026, 12:20Poster Presentation
Quantics Tensor Cross Interpolation (QTCI) provides an efficient tensor-network representation of high-resolution functions by encoding physical coordinates into binary degrees of freedom and constructing a tensor train directly from sampled function values. Although QTCI is effective for many structured functions, its efficiency can deteriorate when the target function develops strong...
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Dr Sayan Mukherjee (The University of Tokyo)26/08/2026, 12:20Poster Presentation
Higher-order tensor renormalization group (HOTRG) methods coarse-grain a tensor network by iterated blocking, implicitly assuming that the coarse network again admits a finite periodic description. We make this assumption explicit: representing a periodic tensor network as the lift of a finite-cell voltage graph over a group $\Lambda$, an expanding finite-index endomorphism of $\Lambda$...
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Sing Hong Chan (National Tsing Hua University)26/08/2026, 12:20Poster Presentation
Critical 2D classical lattice models are analyzed through a method-agnostic finite-size-scaling framework built on tensor-network transfer matrices. The key idea is an explicit crossover length scale that separates the finite-size-scaling regime from the finite-entanglement-scaling regime induced by bond-dimension truncation. Working within this self-consistent finite-size window, the central...
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Rentaro Kuromi (Keio university)26/08/2026, 12:20Poster Presentation
The spin-1 XXZ chain with uniaxial single-ion anisotropy exhibits a rich ground-state phase diagram, hosting topologically distinct Haldane and large-D phases alongside various magnetically ordered and gapless phases. In 1986, H. J. Schulz formulated an effective field theory for this system by mapping it onto coupled spin-1/2 chains (i.e., a ladder) and derived its phase diagram via...
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Yuheng Sui (Keio University)26/08/2026, 12:20Poster Presentation
Configuration-space truncation is a basic step in quantum-selected configuration interaction and related sample-based diagonalization methods, but the number of basis configurations required to retain a prescribed fraction of a many-body state is generally unknown. We study this intrinsic truncation problem for the fixed-particle-number ground state of the periodic XX, or free-fermion, chain....
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Haruyuki Kawabe (BIPROGY Inc.)26/08/2026, 12:20Poster Presentation
Efficient simulation of quantum circuits remains a central challenge in quantum information science. We introduce Matrix Product Evolution (MPE), a tensor-network framework that represents the evolution of each qubit as a tensor train organized along the temporal direction of a circuit. Temporal bond dimensions encode correlations accumulated during circuit evolution, and neighboring MPEs are...
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Ryuhei Furuta (University of Electro-Communications)26/08/2026, 12:20Poster Presentation
Neural-network quantum states have been developed as an efficient method for solving quantum many-body problems, not only in lattice systems but also in systems of particles in continuous space. Here, we apply this approach to strongly interacting few-body problems in continuous space at unitarity: the Efimov states and associated few-body bound states. We obtain the ground and first excited...
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Dr Jing Zhou (OIST)26/08/2026, 12:20Poster Presentation
Periodically driven magnetic systems provide a versatile platform for controlling collective spin excitations far from equilibrium. We theoretically study a two-dimensional antiferromagnet driven by in-plane polarized light, where the exchange interactions acquire Floquet modulations. The drive induces short-time amplification of selected magnon modes, which can be effectively described by a...
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Haruki Shimizu (ISSP, The university of Tokyo)26/08/2026, 12:20Poster Presentation
The Klein bottle ratio provides universal values other than the central charge. Here, we extend the Klein bottle ratio and the $\mathrm{RP}^2$ ratio to non-Hermitian systems with periodic boundary conditions. Using the Yang-Lee model, we confirm the behavior of these ratios, as well as the generalized entanglement entropy. We also observe universal behaviors of these ratios for the...
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Junya Yokokura (Department of Physics, Graduate School of Science, The University of Tokyo)26/08/2026, 12:20Poster Presentation
Isometric tensor networks provide globally optimal low-rank approximations without environment computation. However, this property is guaranteed only at the orthogonality center, making node-level parallelization difficult. In contrast, node-level parallelization has been developed based on Vidal canonical form [1,2], though the canonical conditions and the truncation optimality are gradually...
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Ashish Joshi (Keio University)26/08/2026, 12:20Poster Presentation
Biological systems, such as cellular metabolism, involve thousands of reactions that together determine how cells grow, respond to their environment, and produce energy. These are interconnected chemical reactions forming metabolic networks. Modeling and analyzing these systems require solving very large mathematical problems that can quickly become computationally prohibitive. To address this...
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Jean-Baptiste Touchais (National Cheng Kung University)26/08/2026, 12:20Poster Presentation
Robust propagating in-gap modes due to spin-orbit domain walls in graphene
Recent success in making twisted multilayered graphene and transition metal dichalcogenides, exhibiting Moiré patterns and consequent domain structures on the nanoscale, raises questions about possible topological electronic states on domain walls (DWs) in presence of multiple induced couplings. We investigate...
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Mr QianCan Chen (National Tsing Hua University)26/08/2026, 12:20Poster Presentation
We develop a symmetry-resolved QTT framework for two-particle wavefunctions, using permutation parity to target symmetric or antisymmetric spatial states. Applied to H₂ within the Born–Oppenheimer approximation, QTT-DMRG accurately reproduces the ground singlet X 1Σg+ and lowest triplet b 3Σu+ states, with errors reaching 10^-4 Hartree. The second-order Rényi entropy approaches ln(2) at large...
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Kiyeon Kim (Seoul National University)26/08/2026, 12:20Poster Presentation
Telum.jl is a non-Abelian tensor network library written entirely in Julia. Its internal Clebsch–Gordan engine, LurCGT.jl, extends the approaches of QSpace and TensorKit.jl to compute symmetry-related quantities for SU(N), Sp(2N), SO(N), and G2 exactly using integer arithmetic and in a deterministic manner. Telum.jl is designed to handle tensors with arbitrary combination of these symmetries,...
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Teruhiro Ikeuchi (Keio University)26/08/2026, 12:20Poster Presentation
Quantum master equations are widely used to describe the dynamics of open quantum systems. Among them, the Redfield equation provides high accuracy but may generate unphysical time evolution because it does not preserve positivity. To overcome this issue, the Gorini–Kossakowski–Sudarshan–Lindblad (GKSL) equation, which generates completely positive and trace preserving (CPTP) dynamics, has...
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Shoichiro Kado (Graduate School of Informatics, Kyoto university)26/08/2026, 12:20Poster Presentation
Clifford-augmented matrix product states (CAMPS), which combine a Clifford circuit with a matrix product state (MPS), have recently been introduced as an efficient framework for quantum many-body simulations. In this work, we extend the CAMPS framework to transfer-matrix calculations for classical spin systems by exploiting the quantum–classical correspondence. We investigate the extent to...
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Prof. Giuseppe Carleo (EPFL)27/08/2026, 10:00Lecture / Invited Talk
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Alessandro Sinibaldi (EPFL)27/08/2026, 11:20
Thermalization in strongly correlated fermionic systems remains a central open problem in quantum many-body physics.
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In this work, we investigate the real-time dynamics and the approach to thermalization in the two-dimensional Hubbard model, a paradigmatic framework for correlated electrons, relevant to high-temperature superconductivity and ultracold quantum simulation.
Focusing on the... -
Wei-Lin Tu (Keio University)27/08/2026, 11:40
High-dimensional correlations present a monumental challenge in both quantum physics and deep learning, typically requiring exponential computational resources or excessively deep architectures to resolve. This talk highlights low-rank tensor structures as a unifying solution to conquer complexity across these two distinct domains. First, we pivot to highly frustrated magnetism...
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Yoshitomo Kamiya (Okinawa Institute of Science and Technology)27/08/2026, 12:00
A faithful reconstruction of a quantum many-body state enables the inference of physical properties not directly accessible from the input marginals. Achieving such predictive reconstruction is challenging because a tractable set of reduced density matrices does not generally determine the global state uniquely, and the many-body Hilbert space grows exponentially with system size. Here we...
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Dr Jurai Hasik (Univ. Zurich)27/08/2026, 14:00Lecture / Invited Talk
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Chia-Min Chung (NYCU)27/08/2026, 15:00
We present an approach to solve two-fermion problems using the Quantic Tensor Train (QTT) method. The QTT format allows us to represent high-resolution wavefunctions and operators with a memory cost that only scales logarithmically with the number of grid points. We demonstrate our method by showing our calculations on the ground state of a hydrogen molecule ($H_2$) and its quantum dynamics...
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Akira Matsumoto (Osaka Metropolitan University)27/08/2026, 15:20
The matrix product state (MPS) can efficiently approximate low-entanglement states in 1D quantum many-body systems. However, applications to the gapless phase, periodic boundary case, and higher-dimensional systems are limited due to rapid growth of entanglement. Recently, Clifford-circuit-augmented MPS has been proposed as a hybrid ansatz of the Clifford circuit and MPS. The Clifford circuit...
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Dr Shinichiro Akiyama (University of Tsukuba)27/08/2026, 16:00Lecture / Invited Talk
Tensor networks offer a novel way to investigate lattice field theories. The community has been making various efforts toward their future application to QCD at finite temperature and finite density. In this talk, I will explain our recent studies, including methods for finite-temperature lattice gauge theories, Grassmann tensor networks, the use of symmetry-twisted partition functions, and...
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Prof. Fernando Brandão (AWS and Caltech)28/08/2026, 10:00Lecture / Invited Talk
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Shimpei Yamaguchi (Keio University)28/08/2026, 11:20
Hypothesis testing is a fundamental framework for making decisions between competing explanations of a system on the basis of observed data. In quantum information science, it underlies tasks such as signal detection, quantum sensing, communication, and the verification of quantum devices, where one must infer which quantum state or physical process generated the observed measurement outcomes....
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Chia-Ho Ou (Graduate School of Information Sciences, Tohoku University, Sendai, Japan)28/08/2026, 11:40
Under increasing environmental pressures, ecological corridor planning is vital for maintaining habitat connectivity. However, traditional approaches such as Minimum Cumulative Resistance (MCR) often generate singular, line-like paths that are highly vulnerable to local disruptions. In this study, we reformulate corridor design as a Quadratic Unconstrained Binary Optimization (QUBO) problem,...
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Ms Shih-Han Huang (National Pingtung University)28/08/2026, 12:00
High-order combinations of genetic and environmental factors may reveal risk-associated subgroups in oral malignant disorders, but their exhaustive evaluation grows combinatorially, while heuristic methods provide no guarantee of global optimality. We formulate corrected-odds-ratio barcode discovery as a feature-level fractional quadratic unconstrained binary optimization (QUBO) problem....
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Prof. Nobuyuki Yoshioka (Univ. of Tokyo)28/08/2026, 14:00Lecture / Invited Talk
Recent experimental advances in quantum error correction have pushed the field beyond the break-even point, offering a credible path toward early fault-tolerant quantum computing (FTQC) with logical qubits. In this emerging regime, two challenges become central: low-cost implementation of non-Clifford logical gates and full usage of syndrome information.
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In the first part of this talk, we... -
Wojciech Roga (Keio University)28/08/2026, 15:00
Bell-state measurements are central to photonic quantum information with applications in quantum teleportation, entanglement swapping, quantum repeaters, dense coding, and fusion-based photonic quantum computation. A passive linear optical interferometer with vacuum auxiliary modes and photon number resolving detectors can unambiguously identify at most two of the four equiprobable Bell states...
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Tomohiro Hattori (Keio University)28/08/2026, 15:20
Constrained combinatorial optimization problems (CCOPs) arise in a wide range of practical applications. Quantum optimization methods have attracted considerable attention as heuristic approaches to solving these problems. Because current quantum hardware is limited by short coherence times and gate errors, optimization methods based on relatively short quantum evolutions are desirable....
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