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Introduction to Quantum Annealing: from Fundamentals to Applications

2019年9月2日(月) - 3日(火)

入江 広隆 (理化学研究所 数理創造プログラム (iTHEMS) 客員研究員 / 株式会社デンソー 先端技術研究所 アシスタントマネージャー)

Sep. 2 (Mon) 10:30-12:00, 13:30-15:00, 15:30-17:00 Lecture 1: What is quantum annealing and quantum computation? Lecture 2: Quatum Ising models as flux-qubit degree of freedom Lecture 3: Basic usage of quantum annealer Sep. 3 (Tue) 10:30-12:00, 13:30-15:00, 15:30-17:00 Lecture 4: Optimization problems and computational complexity Lecture 5: Real-world applications Lecture 6: Some other topics Room: 435-437 (main research building): Sep.2 (Mon) am 424-426 (main research building): Sep.2 (Mon) pm & Sep.3 (Tue) am+pm Abstract: Quantum annealing is a quantum-computational scheme which tackles computationally hard optimization problems. Its quantum-mechanically implemented machine, called quantum annealer, is commercially manufactured by D-Wave Systems, Inc., and is currently available with more than 2000 quantum bits. In this two-day lecture, I would like to discuss fundamental aspects of quantum annealing (1st day) and its real-world applications (2nd day). In particular, I try to overview the current status of the machine and several problems which we should theoretically overcome. In the first day, I will start with discussing what is quantum annealing and then review how quantum Ising model is implemented with flux-qubit degree of freedom. Later on, I will discuss the basic usage of the quantum annealer as a preparation for applications. In the second day, I will first summarize several classes of optimization problems and their computational complexity, and then discuss examples of real-world applications of quantum annealing. Finally, if I have enough time, I would like to discuss other related topic on quantum annealing.

会場: 研究本館 435-437号室 / 研究本館 424-426号室

イベント公式言語: 英語

SUURI-COOL (Kyushu) Lecture

2019年7月31日(水) - 8月2日(金)

土井 琢身 (理化学研究所 数理創造プログラム (iTHEMS) 専任研究員 / 理化学研究所 仁科加速器科学研究センター (RNC) 量子ハドロン物理学研究室 専任研究員)

SUURI-COOL (Kyushu) at the Ito-campus of Kyushu Univ. will be launched on July 31, 2019. As a first event at SUURI-COOL (Kyushu), the following lecture by Takumi Doi (RIKEN Nishina Center/iTHEMS) will be held. Feel free to join if you will be around Ito-campus. Nuclei, many-body systems of baryons as protons and neutrons, are ultimately consist of elementary particles of quarks and gluons and their properties are governed by quantum chromodynamics (QCD). Recently, a new theoretical method is developing in lattice QCD, the first-principles calculation of QCD, and the new era is dawning where nuclear physics is constructed directly based on QCD. In this lecture, I first introduce the formulation of lattice QCD. I will then discuss the theoretical foundation and the latest numerical results about the lattice QCD study of hadron interactions, the key quantities to construct nuclear physics from QCD. I will also give a lecture on computational science, in particular, about supercomputers.

会場: SUURI-COOL (Kyushu)

イベント公式言語: 英語

1-day Workshop on Quantum Gravity

2019年7月4日(木) 9:30 - 18:00

In order to construct a quantum theory of gravity, it is currently required to study freely from various viewpoints. In this small workshop, we will discuss various different topics such as field theory, string theory, quantum black hole, quantum universe and so on, and will consider future directions to quantum gravity casually but deeply. Let's enjoy exciting discussions!

会場: セミナー室 (132号室)

イベント公式言語: 英語

Spacetime Geometry of Black Holes, Wormholes, and Time Machines

2019年7月2日(火) 15:30 - 17:00

Pei-Ming Ho (Distinguished Professor, Department of Physics, National Taiwan University, Taiwan)

Since the advent of General Relativity, people have found many solutions with interesting spacetime geometries. Most notably, the black holes have attracted a lot of attention for their roles in generating gravitational waves, and for inducing the information loss paradox. In this talk, we consider black holes amongst other geometric structures and investigate the subtlety involved in the quantum effect such as Hawking radiation. In this context, we mention wormholes and time machines, and explain how they are conceptually related to the geometry under the horizon of a black hole. There will also be comments on my recent research result about how quantum effect must be large for observers sitting on top of the black hole horizon.

会場: 統合支援施設（第一食堂） 2階 大会議室

配信:計算科学研究棟 R511 / SUURI-COOL (Kyoto) / SUURI-COOL (Sendai)

イベント公式言語: 英語

Quantum physics and science with open-source software: QuTiP, the Quantum Toolbox in Python

2019年6月13日(木) 10:00 - 11:30

ナタン・シャマー (理化学研究所 開拓研究本部 (CPR) Nori理論量子物理研究室 特別研究員)

I will address the rise of open source software based on the Python language ecosystem in quantum physics research, in particular with relevance to quantum technology and quantum computing. I will introduce the Quantum Toolbox in Python, QuTiP, a very popular software in the quantum tech community, whose core development has revolved around Prof. F. Nori’s group at RIKEN since 2011. QuTiP is open-source software for simulating the dynamics of closed and open quantum systems, and is used for quantum information science and cavity quantum electrodynamics studies. The QuTiP ecosystem has grown considerably in the past years, with many quantum tech libraries using its functionalities, similarly to what has happened for AstroPy in the astrophysics community. Following the seminar, an interactive session will illustrate some features of this software package library. I will also show, drawing from recent research examples, how everyone can build its own library. Only a laptop with wifi working is required to join the hands-on session.

会場: 仁科ホール

イベント公式言語: 英語

Quantum Mechanics of an Evaporating Black Hole

2019年6月6日(木) 15:30 - 17:00

野村 泰紀 (Professor/Director, Berkeley Center for Theoretical Physics, University of California, Berkeley, USA)

会場: セミナー室 (160号室)

イベント公式言語: 英語

Introduction to Quantum Computation

2019年5月13日(月) - 15日(水)

松浦 俊司 (Fundamental Researcher, Quantum Simulation Division, 1QBit, Canada)

The schedule of the lectures on "Quantum Computation" by Dr. Shunji Matsuura (1QBit) is as follows. May 13 (Mon) [Lecture 1] 10:00-11:30, [Lecture 2] 14:00-15:30 May 14 (Tues) [Lecture 3] 10:00-11:30, [Lecture 4] 14:00-15:30 May 15 (Wed) [Lecture 5] 10:00-11:30, [Lecture 6] 14:00-15:30

会場: 仁科ホール

イベント公式言語: 英語

Three quantizations of conformal field theory

2019年5月1日(水) 15:40 - 17:30

多田 司 (理化学研究所 数理創造プログラム (iTHEMS) コーディネーター / 理化学研究所 仁科加速器科学研究センター (RNC) 量子ハドロン物理学研究室 副主任研究員)

Needless to say, conformal field theory is elemental in the study of string theory, statistical quantum systems, and various quantum field theories. Two-dimensional conformal field theory is usually quantized by the so-called radial quantization. However, this is not the only way. As a matter of fact, there are two other distinctive choices for the time foliation, or equivalently, the Hamiltonian. One of these choices yields the continuous Virasoro algebra, while the other choice leads to the Virasoro algebra on a torus. The former case corresponds to the recently found (and perhaps less known) phenomenon, sine-square deformation. The latter yields the well-known entanglement entropy. I will present a comprehensive treatment of these three quantizations and discuss its physical implications.

会場: Old LeConte Hall 402, UC Berkeley

イベント公式言語: 英語

Quantum computing: current status and prospects

2019年4月25日(木) 15:00 - 16:30

藤井 啓祐 (大阪大学 大学院基礎工学研究科 教授)

Supported by extensive experimental efforts for realization of quantum computing devices, quantum computers of a hundred qubits are now within reach in the near future. This level of a quantum computer is not enough for fully fledged fault-tolerant quantum computing, but is still expected to have computational advantage against classical computers. Such a noisy intermediate scale quantum computing (NISQ) device is thought to be a testbed for proof-of-principle experiments of quantum algorithms and verification of quantum physics in the limit of extremely high complexity. In this talk, I will provide a general introduction to quantum computing starting from how and for what quantum computers work. Then I will provide an overview of the current status and prospects of the field of quantum computing. As the final part, I will also talk about our own activities on quantum-classical hybrid algorithm, which is a kind of quantum algorithms specifically designed for the NISQ devices.

会場: 鈴木梅太郎記念ホール

配信:計算科学研究棟 R511 / SUURI-COOL (Kyoto) / SUURI-COOL (Sendai)

イベント公式言語: 英語

International Molecule-type Workshop "Frontiers in Lattice QCD and related topics"

2019年4月15日(月) - 26日(金)

International Molecule-type Workshop "Frontiers in Lattice QCD and related topics" will be held in Yukawa Institute for Theoretical Physics (YITP) on April 15 - 26, 2019 under the support of iTHEMS and YITP. Lattice quantum chromodynamics (QCD) is a systematic method to investigate strong interaction of hadrons with numerical simulations. In this workshop, frontiers of lattice QCD will be discussed under relaxed atmosphere in Kyoto. Organizers: Sinya Aoki (YITP), Yasumichi Aoki (RIKEN, CCS), Hidenori Fukaya (Osaka U.), Shoji Hashimoto (KEK), Tetsuo Hatsuda (RIKEN, iTHEMS), Takumi Doi (RIKEN, Nishina Center), Atsushi Watanabe (YITP)

会場: 京都大学基礎物理学研究所

イベント公式言語: 英語

Tensor Berry connections and their topological invariants

2019年4月2日(火) 14:00 - 15:00

ジャンドミニコ・パルンボ (Researcher, Université Libre de Bruxelles, Belgium)

The Berry connection plays a central role in our description of the geometric phase and topological phenomena. In condensed matter, it describes the parallel transport of Bloch states and acts as an effective "electromagnetic" vector potential defined in momentum space. Inspired by developments in high-energy physics, where higher-form Kalb-Ramond gauge fields were introduced, I hereby explore the existence of "tensor Berry connections" in quantum matter. My approach consists in a general construction of effective gauge fields, which I ultimately relate to the components of Bloch states. I apply this formalism to various models of topological matter, and I investigate the topological invariants that result from generalized Berry connections. I introduce the 2D Zak phase of a tensor Berry connection, which I then relate to the more conventional first Chern number; I also reinterpret the winding number characterizing 3D topological insulators to a Dixmier-Douady invariant, which is associated with the curvature of a tensor connection. Besides, my approach identifies the Berry connection of tensor monopoles, which are found in 4D Weyl-type systems in ultracold atoms.

会場: セミナー室 (160号室)

イベント公式言語: 英語

The 2nd International Workshop on Quantum Many-Body Problems in Particle, Nuclear, and Atomic Physics

2019年3月7日(木) - 11日(月)

会場: University of Khanh Hoa, Nha Trang City, Vietnam

イベント公式言語: 英語

RIKEN-Berkeley WS on Quantum Information Science (RB19)

2019年1月25日(金) - 29日(火)

Initiated by the RIKEN Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS) program at Berkeley, this workshop will focus on the development of quantum computing techniques, quantum materials, and quantum sensing, as well as their corresponding applications to physical sciences, with an emphasis to galvanize the participants into future collaboration. Organizing Committee: Chia Cheng Chang (RIKEN iTHEMS/UCB/LBNL NSD) Takumi Doi (RIKEN iTHEMS) Tetsuo Hatsuda (RIKEN iTHEMS) Wick Haxton (UCB/LBNL NSD/RIKEN iTHEMS) Alan Poon (LBNL NSD/BQ) Advisory Committee: Jonathan Carter (LBNL CRD/BQ) Yasunobu Nakamura (RIKEN CEMS/Tokyo) Franco Nori (RIKEN/Michigan) Thomas Schenkel (LBNL AT-AP/BQ) Irfan Siddiqi (UCB/BQ) Seigo Tarucha (RIKEN CEMS/Tokyo) Co-hosted by RIKEN iTHREMS　 RIKEN CEMS　 Lawrence Berkeley National Lab. (LBNL)　 Univ. of California at Berkeley (UCB)　 Supported by Berkeley Quantum (bq)　 US Dept. of Energy (DOE)　

会場: Lawrence Berkeley National Laboratory (Berkeley, California)

イベント公式言語: 英語

Universal clusters and Efimov physics

2019年1月8日(火) 10:30 - 17:00

パスカル・ネドン (理化学研究所 仁科加速器科学研究センター (RNC) 量子ハドロン物理研究室 専任研究員)

Unlike classical systems, quantum few-body systems can be unbound in the presence of short-range attractive forces. Near the critical strength of the forces at which they can become bound (resonant forces), they exhibit universal properties that are independent of the details of the forces. In this lecture, I will explain in detail the universality of systems with resonant short-range forces, in particular the Efimov effect for 3 or more particles. I will also present the universal properties of systems with power-law interaction forces, such as van der Waals forces that are relevant to neutral atoms.

会場: Brain Science Ikenohata Research Bldg. (3rd floor, C56)

イベント公式言語: 英語

Spintronics: from electrons to quarks (iTHEMS-CEMS Joint Meeting)

2018年11月7日(水) 10:00 - 17:30

Program: 10:00-10:15　T. Hatsuda (RIKEN) “Opening” 10:15-10:45　S. Maekawa (RIKEN) “Introduction to Spintronics”. 10:45-11:45　M. Matsuo (KITS, Beijing) “Spintronics phenomena in non-inertial frames” (Review) 13:30-14:30　M. Hongo (Riken) “Introduction to chiral transport phenomena” (Review) 14:30-15:00　Y. Hidaka (RIKEN) “Non-Equilibrium Quantum Transport of Chiral Fluids” 15:30-16:00　Y. Tsutsumi (RIKEN) “Spin-Vorticity Coupling in Liquid He”. 16:00-16:30　T. Takiwaki (NAOJ) “Chiral magnetohydrodynamic turbulence in core-collapse supernovae” 16:30-17:30　Discussion (and Closing by T. Hatsuda)

会場: セミナー室 (160号室)

イベント公式言語: 日本語

International Symposium on Quantum Fluids and Solids (QFS)

2018年7月25日(水) - 31日(火)

The International Symposium on Quantum Fluids and Solids (QFS) will be held at Ito International Research Center (IIRC) on Hongo campus of the University of Tokyo, Japan, from July 25 through 31, 2018. One of the sponsors of this conference is iTHEMS. The QFS series started forty-three years ago making it one of the oldest series of international conferences in the field of low temperature physics. It has historically been focusing on physics of liquid and solid helium and hydrogen. But in this century its scope is expanding widely from laser cooled cold atoms to topological matters. At QFS2018 in Tokyo, this trend will be continued and with even more interdisciplinary aspects emphasized between the traditional subjects and those in broader physical systems.

会場: 東京大学 本郷キャンパス 伊藤国際学術研究センター

イベント公式言語: 英語

Bell's Theorem, Entanglement, Quantum Teleportation and All That

2018年7月19日(木) 16:00 - 17:30

Anthony James Leggett (Professor, University of Illinois at Urbana-Champaign, USA)

iTHEMS-CEMS Joint Colloquium. Professor Leggett is widely recognized as a world leader in the theory of low-temperature physics, and his pioneering work on superfluidity was recognized by the 2003 Nobel Prize in Physics. Abstract: One of the most surprising aspects of quantum mechanics is that under certain circumstances it does not allow individual physical systems, even when isolated, to possess properties in their own right. This feature, first clearly appreciated by John Bell in 1964, has over the last half-century been tested experimentally and found (in most people's opinion) to be spectacularly confirmed. More recently it has been realized that it permits various operations which are classically impossible, such as "teleportation" and secure-in-principle cryptography. This talk is a very basic introduction to the subject, which requires only elementary quantum mechanics.

会場: 大河内記念ホール

配信:計算科学研究棟 311会議室 / SUURI-COOL (Kyoto) / 東北大学 AIMR本館 2階セミナー室

イベント公式言語: 英語

Introduction to topological band structure

2018年7月6日(金) 10:30 - 17:30

小澤 知己 (理化学研究所 数理創造プログラム (iTHEMS) 上級研究員)

In this seminar, I give an introduction to topological band structures. Topological band structure is the fundamental idea to understand phenomena such as the quantum Hall effect, topological insulators, and topological superconductors. Although originally found in fermionic electron systems, topological band structure is essentially a single-particle property, and thus the same phenomenon can arise also in bosonic systems. In fact, topological band structure does not even need quantum mechanics; topological band structure can arise in classical waves inside a periodic medium, such as electromagnetic waves or classical mechanical waves. In this seminar, I first give a brief introduction to key concepts in topological band structures, such as Berry curvature, Chern number, bulk-edge correspondence, and ten-fold way classification of topological insulators. I then explain how topological band structure can arise in classical systems, giving a brief introduction to the field of topological photonics and topological mechanics.

会場: セミナー室 (160号室)

イベント公式言語: 日本語

Topological Photonics and the four-dimensional quantum Hall effect

2018年7月3日(火) 15:00 - 17:00

小澤 知己 (理化学研究所 数理創造プログラム (iTHEMS) 上級研究員)

In this seminar, I will give an introduction to topological photonics, that is, the study of topological band structures and resulting topological phenomena in photonic systems. I will first review basic concepts of topological band structures, and then explain what it means to realize topological band structures in photonic systems. I will particularly emphasize some important differences with respect to solid-state electron systems. I then present some of my own works in topological photonics, such as the synthetic dimensions in photonic systems, which allows one to explore models and phenomena in high dimensions including the four-dimensional quantum Hall effect.

会場: 東北大学 AIMR本館 1階会議室

イベント公式言語: 英語