KEK-THEORY Workshop 2024

Dec 11, 2024, 9:00 AM → Dec 13, 2024, 1:45 PM Asia/Tokyo

K03 Seminar Hall (KEK Tsukuba Campus)

KEK Theory Workshop is an annual workshop on string theory and quantum field theory. Since KEK Theory Workshop 2014, it has been held as an international workshop. Speakers are invited from abroad as well as from Japan, and all talks are given in English.

This year we aim to provide a valuable opportunity to have extensive discussions on new developments in tensor networks, quantum information and quantum computing from the viewpoint of particle physics, quantum gravity and condensed matter physics applications. The invited speakers are selected from various research fields, and we have asked them to give a pedagogical exposition of the big picture in their own research field with the right amount of technical details, which are useful in building up a comprehensive understanding of the notions and their mutual relationship.

The workshop will be ON-SITE at KEK Tsukuba Campus on December 11 (Wed.) -- 13 (Fri.), 2024, without on-line attendance. Please visit K03 Building.

Invited Speakers

• Dec.11 (Wed)
  - Shinji Takeda (Kanazawa University)
      Tensor renormalization group and application to elementary particle physics
  - Tsuyoshi Okubo (The University of Tokyo)
      Recent progress in tensor network approaches for condensed matter physics
  - Hiroki Ohata (KEK)
      Bosonization revisited: application to the sign problem and lattice chiral fermion
• Dec.12 (Thu)
  - Yutaro Akahoshi (Fujitsu, Ltd.)
      Partially fault-tolerant quantum computing architecture
  - Tatsuma Nishioka (Osaka University)
      Quantum Error Correction and Holography Principle
  - Yoshifumi Nakata (Kyoto University)
      Decoding quantum information from chaos: beyond the standard situation
• Dec.13 (Fri)
  - Slava Rychkov (Institut des Hautes Etudes Scientifiques)
      Some rigorous and numerical results for renormalization groups of tensor networks
  - Hiroshi Ueda (Osaka University)
      Advancements in Numerical Methods: Synergy of Tensor Networks and Quantum Algorithms
  - Masaki Oshikawa (Institute for Solid State Physics, The University of Tokyo)
      Tensor Networks as Conceptual and Computational Tools for Statistical Physics

Short Talks

We will arrange short talk sessions on more diverse topics, for which participants can apply. If there are too many applicants, we will have to make some selection.

Workshop Registration

• Registration Deadline: Oct. 26 (Sat), 2024.
• Please indicate your requests for: financial support, VISA, banquet participation, and a short talk presentation.
• No registration fee, No coffee/snack fee.
• Banquet will be at evening on the first day (Dec. 11th) at KEK with a catering from a chinese restaurent (百香亭). A price will be 3000Yen for students, 5000Yen for faculty staffs / postdocs.

 

Scam Email Warning

Please be aware of potential scams claiming to make housing reservations on your behalf. We were made aware of some participants receiving such messages from "Conferences@reservationsmanagement.org" or similar addresses. Please ignore such emails and do not reply, do not click shared links, and do not provide your credit card information.

Organizers

Yuta Hamada, Kohta Hatakeyama, Machiko Hatsuda,
Satoshi Iso, Gregory Joseph Loges, Kohtaroh Miura,
Shun'ya Mizoguchi, Jun Nishimura, Hiroki Ohata, Katsuta Sakai

Secretary

Yuko Ohno (Ms.)  yukoohno[at]post.kek.jp
(Please replace [at] with @.)

 

 

Wednesday, December 11

Reception

Opening Address: Welcome to KEK-THEORY Workshop 2024

Convener: Dr Kohtaroh Miura

miura_kekth2024_opening.pdf

Plenary Session: I

Convener: Dr Shin-ichiro Akiyama

1 Tensor renormalization group and application to elementary particle physics

Tensor network is a powerful numerical tool to compute the wave function of quantum many-body systems and to directly evaluate the path integrals in quantum field theory. In this talk, I mainly explain the latter case in detail. After introducing the basics of the tensor network. I give an overview of its recent progress especially in elementary particle physics. As specific examples, I explain how to compute the entanglement entropy, spectroscopy using tensor network, and recent developments of the tensor network coarse-graining algorithms. Finally I mention future perspective towards lattice QCD.

Speaker: Prof. Shinji Takeda

20241211_takeda_talk (2).pdf

10:30 AM Coffee Break

Plenary Session: II

Convener: Dr Shin-ichiro Akiyama

2 Recent progress in tensor network approaches for condensed matter physics

Speaker: Dr Tsuyoshi Okubo

KEK20241211_Okubo.key

11:45 AM Lunch Break

Plenary Session: III

Convener: Dr Shin-ichiro Akiyama

3 Bosonization revisited: application to the sign problem and lattice chiral fermion

Speaker: Dr Hiroki Ohata

KEK_TH_Ohata.pdf

2:30 PM Coffee Break

Parallel Session: IA

Convener: Prof. Shin Nakamura

4 Tensor renormalization group study of (1+1)-dimensional U(1) gauge-Higgs model at $\theta = \pi$ with Luescher's admissibility condition

Speaker: Dr Shin-ichiro Akiyama

akiyama_12_11.pdf

5 Tensor renormalization group study of 3D Yang-Mills theories with the reduced tensor network formulation

Speaker: Dr Atis Yosprakob

KEK-TH.Dec.11.2024_v1.pdf

6 Grassmann bond-weighted tensor renormalization group approach to 1+1D two-color QCD with staggered fermions at finite density

Speaker: Mr Ho Pai Kwok

Kwok_KEK.pdf

7 Tensor renormalization group analysis of entanglement entropy in (1+1)-dimensional XY model

Speaker: Dr Gota Tanaka

20241211_GotaTanaka.pdf

Parallel Session: IB

Convener: Dr Yuta Hamada

8 deSitter from M-Theory

Speaker: Dr Gregory Loges

2024_12_11_LOGES.pdf

9 Non-supersymmetric heterotic strings

Speaker: Mr Arata Ishige

ArataIshige.pdf

10 Quantum Black Brane in the 4d Standard Model

Speaker: Mr Hayate Kimura

KEK_TH_2024_Hayate_Kimura.pdf

11 Species scale in one-loop correction

Speaker: Mr Yuri Michinobu

KEK_Th_yuri.pdf

4:30 PM Coffee Break

Parallel Session: IIA

Convener: Dr Yui Hayashi

12 Non-Lagrangian approach to GKP-Witten relation by conformal smearing

Speaker: Prof. Sinya Aoki

SinyaAoki.pdf

13 Quantum tunneling, decoherence and the beginning of the Universe from Lefschetz thimble real-time simulations

Monte　Carlo simulations of quantum time-evolution based on the real-
time path integral have been thought to be extremely difficult since it involves a
phase factor exp(iS) in the integrand, which causes a severe sign
problem. We apply the Lefschetz thimble method with various new
techniques to such systems. In this talk, I would like to discuss a new
understanding of quantum tunneling and quantum decoherence that arises
as complex saddle point configurations. I would also like to discuss how
one can apply this method to investigate the beginning of the universe
based on quantum gravity.

Speaker: Prof. Jun Nishimura

Nishimura-KEK-TH241211v1.pdf

14 Complex Langevin Lattice QCD for Color-Superconductivity at Extremely High Density

Speaker: Kohtaroh MIURA (KEK IPNS)

miura_kekth2024.pdf

Parallel Session: IIB

Convener: Dr Ryo Yokokura

15 't Hooft line in 4D U(1) lattice gauge theory, and microscopic descriptions of dyon's statistics

Speaker: Mr Soma Onoda

kek_th_2024_Onoda_Soma.pdf

16 Proper Effective Temperature and Order Parameters in Relativistic Non-Equilibrium Steady States

Speaker: Prof. Shin Nakamura

17 A scaling relation in large-N gauge theories at finite temperature

Speaker: Prof. Takeshi Morita

KEK-th-2024-Morita.pdf

6:30 PM Banquet

Catering from 百香亭 (Chinese Restaurent)

Thursday, December 12

Plenary Session: I

Convener: Prof. Sinya Aoki

18 Partially fault-tolerant quantum computing architecture

Speaker: Dr Yutaro Akahoshi

10:30 AM Coffee Break

Plenary Session: II

Convener: Prof. Sinya Aoki

19 Quantum Error Correction and Holography

Speaker: Prof. Tatsuma Nishioka

Tatsuma_Nishioka.pdf

11:45 AM Group Photo

12:00 PM Lunch Break

Plenary Session: III

Convener: Prof. Sinya Aoki

20 Decoding quantum information from chaos: beyond the standard situation

A central challenge in large-scale quantum information processing is
managing noise in quantum systems. Quantum error correction (QEC)
addresses this by encoding quantum states into quantum error
correction codes (QECCs) before noise occurs and decoding them
afterward. Recently, QEC has attracted significant attention in
theoretical physics due to its potential connections to quantum chaos
and quantum gravity. As interest in QEC becomes broader, the decoding
problem --how to decode a general QECC-- is increasingly important. A
few were known so far, but we recently proposed two approaches: one
extends decoders for the standard class of QECCs based on stabilizers
[1], and the other generalizes the Yoshida-Kitaev decoder [2],
originally used to explore the black hole information paradox. In this
talk, we present an overview of these approaches.

1) "Decoding general error correcting codes and the role of
complementarity", YN, T. Matsuura, and M. Koashi, arXiv:2210.06661 (2022).
2) "Explicit decoders using fixed-point amplitude amplification based
on QSVT", T. Utsumi, and YN, arXiv:2405.06051 (2024).

Speaker: Prof. Yoshifumi Nakata

YNakata.pdf

2:30 PM Coffee Break

Parallel Session: IA

Convener: Kohtaroh MIURA (KEK IPNS)

21 Universal structure of islands in evaporating black holes

Speaker: Dr Yoshinori Matsuo

matsuo.pdf

22 Narain CFT from error-correcting code via integers of cyclotomic field

Speaker: Mr Takumi Oikawa

KEKTH_Oikawa.pdf

23 Entanglement R'enyi entropy and boson-fermion duality in the massless Thirring model

Speaker: Mr Harunobu Fujimura

Harunobu_Fujimura_parallel_IA.pdf

24 Thermal Area Law in Long-Range Interacting Systems

Speaker: Dr Donghoon Kim

KEK_Theory_Workshop_DonghoonKim.pdf

KEK_Theory_Workshop_DonghoonKim.pdf

Parallel Session: IB

Convener: Prof. Matsuo Sato

25 Selection rules of topological solitons from non-invertible symmetries in axion electrodynamics

Speaker: Dr Ryo Yokokura

yokokura.pdf

26 Anyon condensation in mixed-state topological order #93

Speaker: Dr Ken Kikuchi

2024-12-12@KEK-TH 2024(KenKikuchi).pdf

27 Bridging two semiclassical confinement mechanisms: monopole and center vortex

Speaker: Dr Yui Hayashi

yui_hayashi.pdf

28 Localized RG flows on composite defects and C-theorem

Speaker: Dr Dongsheng Ge

KEK2024.pdf

4:30 PM Coffee Break

Parallel Session: IIA

Convener: Prof. Asato Tsuchiya

29 Defining IKKT matrix model by gauge fixing Lorentz symmetry

Speaker: Mr Worapat Piensuk

KEKTH2024.pdf

30 Numerical studies of the type IIB matrix model with the gauge-fixed Lorentz symmetry

Speaker: Mr Ashutosh Tripathi

KEKTH2024_Ashutosh_Tripathi.pdf

31 Complex Langevin simulation of the IKKT matrix model with or without "gauge-fixing" the Lorentz symmetry

Speaker: Mr Naoyuki Yamamori

NaoyukiYamamori_2.pdf

32 TBA

Speaker: Dr Kohta Hatakeyama

Parallel Session: IIB

Convener: Dr Gregory Loges

33 Unitarity of string geometry theory

Speaker: Prof. Matsuo Sato

Matsuo_Sato_KEK24.pptx

34 K27 as a symmetry of closed bosonic strings and branes

Speaker: Dr Keith Glennon

Keith Glennon K27 KEK Talk 2024.pdf

35 Revisiting Hawking Radiation via Generalized Uncertainty Principle

The generalized uncertainty relation is expected to be an essential element in a theory of quantum gravity. We examine its effect on the Hawking radiation of a Schwarzschild black hole formed from collapse by incorporating a minimal uncertainty length scale into the radial coordinate of the background. This is implemented in both the ingoing Vaidya coordinates and a family of freely falling coordinates. We find that, regardless of the choice of the coordinate system, Hawking radiation is turned off at around the scrambling time. Interestingly, this phenomenon occurs while the Hawking temperature remains largely unmodified.

Speaker: Mr Tin-Long Chau

Tin-Long Chau KEK-TH 2024.key

36 UV Origin of Late-time Hawking Radiation

We reexamined the connection between the Hawking radiation of a Schwarzschild black hole formed from collapse and ultraviolet(UV) physics with the local Lorentz symmetry violation or the existence of a minimal length. Significant modifications are reported after the scrambling time in both cases, which reflects the UV sensitivity of Hawking radiation. Depending on the physics at the singularity, Hawking radiation with the modified dispersion relation may be largely suppressed with a striking tunneling phenomenon behind. The Hawking wavepacket may exceed the size of the black hole under the generalized uncertainty principle that it longer employs the near horizon Unruh vacuum with a diminishing Hawking radiation amplitude. While a turned-off effect is shared in these two implementations, the Hawking temperature remains the same or only perturbatively corrected.

Speaker: Mr Cheng-Tsung WANG

WANG CHENG-TSUNG_KEK-TH2024.pdf

Friday, December 13

Plenary Session: I

Convener: Dr Kantaro Ohmori

37 Tensor Networks as Conceptual and Computational Tools for Statistical Physics

Speaker: Prof. Masaki Oshikawa

Oshikawa.pdf

10:00 AM Coffee Break

Plenary Session: II

Convener: Dr Kantaro Ohmori

38 Advancements in Numerical Methods: Synergy of Tensor Networks and Quantum Algorithms

Speaker: Prof. Hiroshi Ueda

2024_12_13_HU.pdf

11:15 AM Coffee Break

Plenary Session: III

Convener: Dr Kantaro Ohmori

39 Some rigorous and numerical results for renormalization groups of tensor networks

Speaker: Prof. Slava Rychkov

2024-KEK-2.key.pdf

Closing Address: Summary and Future Prospect

Convener: Prof. Jun Nishimura

Closing-KEKTH241213IFIN.pdf