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Advances in Fluctuating Hydrodynamics: Bridging the Micro and Macro Scales

2024年6月17日(月) - 28日(金)

Abhishek Dhar (Professor, International Centre for Theoretical Sciences, India)
Luca Delacrétaz (Assistant Professor, The University of Chicago, USA)
田之上 智宏 (大阪大学 大学院理学研究科 宇宙地球科学専攻 助教)
芳賀 大樹 (大阪公立大学 大学院工学研究科 電子物理系専攻 助教)
赤松 幸尚 (大阪大学 大学院理学研究科 物理学専攻 助教)
藤井 啓資 (東京大学 大学院理学系研究科 物理学専攻 日本学術振興会 特別研究員 PD)
池田 晴國 (学習院大学 理学部 物理学科 助教)
南 佑樹 (岐阜大学 大学院工学研究科 助教)
中野 裕義 (東京大学 物性研究所 助教)
西田 祐介 (東京工業大学 理学院 物理学系 教授)
佐々田 槙子 (東京大学 大学院数理科学研究科・理学部数学科 教授)

Establishing universal laws in far-from-equilibrium physical systems is one of the outstanding unresolved problems in modern physics. While we have not reached a complete theory applicable to any nonequilibrium system, hydrodynamics provides a promising theoretical tool, which captures universal macroscopic behaviors of nonequilibrium many-body systems. In particular, a hydrodynamic approach with thermal fluctuation, dubbed fluctuating hydrodynamics, successfully describes normal hydrodynamic transports in three-dimensional systems as well as anomalous transports (related to the Kardar–Parisi–Zhang universality class) in low-dimensional systems. The purpose of this workshop is to bring together theorists working on both classical and quantum many-body problems and to explore nonequilibrium physics from the viewpoint of fluctuating hydrodynamics.

会場: 京都大学 基礎物理学研究所 湯川記念館 パナソニック国際交流ホール (メイン会場) / via Zoom

イベント公式言語: 英語

Recent Developments and Challenges in Topological Phases

2024年6月3日(月) - 14日(金)

Thanks to intensive research efforts, topology has been established as a fundamental concept in physics. For closed quantum systems, the classification of gapped topological phases has matured. Moreover, the importance of topology is not limited to isolated quantum systems. Recently, the topology of non-Hermitian Hamiltonians, which effectively describe systems with dissipation, has attracted much attention worldwide. This fascination is exemplified by topological phases and topological phenomena unique to non-Hermitian systems. Against this background, the primary purpose of this workshop is to bring together researchers working on topological phases and to discuss (i) open questions in topological phases of closed quantum systems and (ii) the role of topology in open quantum systems and measurements.

会場: 京都大学基礎物理学研究所

イベント公式言語: 英語

On the volume conjecture for the Teichm ̈uller TQFT

2024年5月31日(金) 15:00 - 17:00

上村 宗一郎 (東京大学 大学院数理科学研究科 博士課程)

The Chern-Simons theory is a topological quantum field theory (TQFT) on the principal G-bundle and has been studied in both mathematics and physics. When G is SU(2), which is compact, Witten conjectured that its path integral gives the topological invariant of the base 3-manifold. This invariant was formulated rigorously and is known as the WRT invariant. In addition, it is known that the expectation value of the Wilson loop along the hyperbolic knot in S3 gives the invariant of knots, which is called the colored Jones polynomial. Invariants of knots and manifolds derived from the path integral are called quantum invariants. There is an open conjecture called the volume conjecture, which states that the complete hyperbolic volume of the knot complement appears in the asymptotic expansion of the colored Jones polynomial. The volume conjecture suggests a close connection between quantum invariants and hyperbolic geometry. On the other hand, Chern-Simons theory with the non-compact G such as SL(2,C) also appears in duality in string theory called the 3d-3d correspondence but has not been well formulated mathematically. Andersen and Kashaev constructed a TQFT-like theory called the Teichm ̈uller TQFT by quantizing the Teichm ̈uller space, which is the deformation space of the hyperbolic structures on a surface. The Teichm ̈uller TQFT is expected to correspond to the SL(2,C) Chern-Simons theory. In this theory, a conjecture similar to the volume conjecture has been proposed and proven for several hyperbolic knots. In this talk, I will introduce the outline of the Teichm ̈uller TQFT and explain our results on the volume conjecture and its proof using techniques in hyperbolic geometry by Thurston, Casson, Rivin, and others.

会場: via Zoom / セミナー室 (359号室)

イベント公式言語: 英語

The New World of Spin Zero - Some Novel Approaches at QUP for Experimental Particle Cosmology -

2024年5月28日(火) 13:30 - 15:00

羽澄 昌史 (高エネルギー加速器研究機構 (KEK) 量子場計測システム国際拠点(QUP) 拠点長)

Particle cosmology is a discipline seeking a fundamental understanding of the Universe based on particle physics. Five mysteries drive our research today: cosmic inflation, baryon asymmetry, neutrino properties, dark matter, and dark energy. Resolving any of the five mysteries will revolutionize our picture of the Universe. Numerous interesting theoretical hypotheses have been proposed to this end. Many require new scalar quantum fields, such as inflatons, axions, supersymmetric particles, etc. They are, in a sense, an attempt to expand the role of the vacuum. Since we have not found such spin-zero fields yet, we shall invent new eyes to make an experimental or observational breakthrough. The International Center for Quantum-field Measurement Systems for Studies of the Universe and Particles (QUP) was established in December 2021 at KEK under the WPI program of MEXT and JSPS. With its tagline of "bring new eyes to humanity," one of the primary missions of QUP is inventing and developing such new eyes for particle cosmology. In this seminar, after briefly introducing QUP, I focus on research topics I have contributed, including the LiteBIRD satellite to study inflatons and light scalar quantum field searches with novel methods using quantum sensing techniques.

会場: 大河内記念ホール / via Zoom

イベント公式言語: 英語

Prefactorization algebra and theta term

2024年5月21日(火) 16:00 - 17:30

川平 将志 (京都大学 基礎物理学研究所 博士課程)

Quantum field theories (QFTs) describe a lot of physical phenomena in our world. And giving a mathematical definition of QFTs is a long-standing problem. There are several mathematical formulations: Wightman formulation, Osterwalder–Schrader formulation and Atiyah-Segal formulation. And each of them cover different aspects of QFTs. Recently, Costello and their collabolators formulate QFTs by using prefactorization algbras. This formulaion cover a lot of classes of QFTs: TQFTs, 2d CFTs and perturbative QFTs. And they reproduce various results such as asymptotic freedom in non-Abelian gauge theories. Prefactorization algbras can be given by Batalin–Vilkovisky quantization (BV quantization) of the Lagrangian. However the original BV quantizations are perturbative and they do not have non-perturbative effects like instantons. In this talk, we propose the way to include Abelian-instanton effects. In modern language, it is the same as ℤgauging.

会場: セミナー室 (359号室) (メイン会場) / via Zoom

イベント公式言語: 英語

Introduction to operator algebras

2024年5月17日(金) 15:00 - 17:00

北村 侃 (理化学研究所 数理創造プログラム (iTHEMS) 基礎科学特別研究員)

I will give a quick introduction to operator algebras. Operator algebras in this talk consist of linear operators over some Hilbert space. Their study was initiated by Murray and von Neumann, motivated partially by the mathematical foundation of quantum mechanics. Starting from the definitions of a few basic notions, I will explain that commutative operator algebras can be interpreted as spaces. On the other hand, simple operator algebras (i.e., those without non-trivial ideals) form a class of operator algebras opposite to commutative ones and have attracted many operator algebraists. I will try to introduce several examples of simple operator algebras, some of which appear in mathematical physics. If time permits, I will also give recent results on ideals in C*-algebras. People with any scientific background are welcome.

会場: via Zoom / セミナー室 (359号室)

イベント公式言語: 英語

Black hole graviton and quantum gravity

2024年5月16日(木) 15:00 - 16:30

木村 裕介 (理化学研究所 量子コンピュータ研究センター (RQC) 量子複雑性解析理研白眉研究チーム 研究員)

Drawing from a thought experiment that we conduct, we propose that a virtual graviton gives rise to a black hole geometry when its momentum surpasses a certain threshold value on the Planck scale. This hypothesis implies that the propagator of a virtual graviton, that possesses momentum surpassing this threshold, vanishes. Consequently, a Feynman diagram containing this type of graviton propagator does not add to the overall amplitude. This mechanism suggests the feasibility of formulating an ultraviolet-finite four-dimensional quantum gravitational theory. The elementary particles including the gravitons are treated as point particles in this formulation.

会場: セミナー室 (359号室) (メイン会場) / via Zoom

イベント公式言語: 英語

Quantum Computing in Omics Medicine

2024年5月10日(金) 16:00 - 17:15

角田 達彦 (東京大学 大学院理学系研究科 生物科学専攻 教授)

(The speaker is also the team leader of Laboratory for Medical Science Mathematics, RIKEN Center for Integrative Medical Sciences. This is a joint seminar with the iTHEMS Biology Group.) In medical science, the recent explosive development of omics technologies has enabled the measurement not only of bulk data from entire tissues, but also data for individual cells and their spatial location information, and even allowed collection of such information in real-time. Meaningful interpretation of these rich data requires an ability to understand high-order and complex relationships that underpin biological phenomena such as drug response, simulating their dynamics, and selecting the optimal treatment for each patient based on these results. While these data are large-scale and of ultra-high dimensionality, they are also often sparse, with many missing values in the measurements and frequent higher-order interactions among variables, making them hard to handle with conventional statistics. To make further progress, machine learning – especially deep learning – is emerging as one of the promising ways forward. We have developed a method to transform omics data into an image-like representation for analysis with deep learning (DeepInsight) and have successfully used it to predict drug response and to identify original cell types from single-cell RNA-seq data. However, anticipation of the vast amount of medical data being accumulated gives particular urgency to addressing the problems of the time it actually takes to train deep learning models and the complexity of the necessary computational solutions. One possible way to resolve many of these problems is “quantum transcendence”, which is made possible by quantum superposition computation. Among all the different ways to apply quantum computation to medical science, we are particularly interested in quantum deep learning based on optimization and search problems, quantum modeling of single nucleotide detection by observational systems and statistical techniques such as regression analysis by inverse matrix computation and eigenvalue computation. In this seminar, I will first present an overview of how quantum machine learning and quantum deep learning can be used to formulate treatment strategies in medicine. We will discuss how to implement the quantum DeepInsight method, the challenges of noise in quantum computation when training QCNNs, feature mapping issues, problems of pretraining in quantum deep learning, and concerns relating to handling sensitive data such as genomic sequences. I hope this seminar will enhance our understanding of how to effectively facilitate medical research with quantum computing.

会場: セミナー室 (359号室) (メイン会場) / via Zoom

イベント公式言語: 英語

Quantum Fine-Grained Complexity

2024年4月18日(木) 10:30 - 12:00

Harry Buhrman (Chief Scientist for Algorithms and Innovation, Quantinuum, UK)

(The speaker is also a professor at University of Amsterdam & QuSoft. This is a joint seminar with the iTHEMS Quantum Computation Study Group.) One of the major challenges in computer science is to establish lower bounds on the resources, typically time, that are needed to solve computational problems, especially those encountered in practice. A promising approach to this challenge is the study of fine-grained complexity, which employs special reductions to prove time lower bounds for many diverse problems based on the conjectured hardness of key problems. For instance, the problem of computing the edit distance between two strings, which is of practical interest for determining the genetic distance between species based on their DNA, has an algorithm that takes O(n^2) time. Through a fine-grained reduction, it can be demonstrated that a faster algorithm for edit distance would imply a faster algorithm for the Boolean Satisfiability (SAT) problem. Since faster algorithms for SAT are generally considered unlikely to exist, this implies that faster algorithms for the edit distance problem are also unlikely to exist. Other problems used for such reductions include the 3SUM problem and the All Pairs Shortest Path (APSP) problem. The quantum regime presents similar challenges; almost all known lower bounds for quantum algorithms are defined in terms of query complexity, which offers limited insight for problems where the best-known algorithms take super-linear time. Employing fine-grained reductions in the quantum setting, therefore, represents a natural progression. However, directly translating classical fine-grained reductions to the quantum regime poses various challenges. In this talk, I will present recent results in which we overcome these challenges and prove quantum time lower bounds for certain problems in BQP, conditioned on the conjectured quantum hardness of, for example, SAT (and its variants), the 3SUM problem, and the APSP problem. This presentation is based on joint works with Andris Ambainis, Bruno Loff, Florian Speelman, and Subhasree Patro.

会場: セミナー室 (359号室) (メイン会場) / via Zoom

イベント公式言語: 英語

Quantum simulation of QCD matter: from hadronic scattering to gauge field qubit encoding

2024年4月3日(水) 10:00 - 11:00

ティエンイン・リー (Ph.D. Student, Institute of Quantum Matter, South China Normal University, China)

Recently, quantum computing (QC) has become a new method for solving non-perturbative problems in high-energy physics. Compared to traditional Monte Carlo simulations, the QC method does not encounter the sign problem, making it an effective approach for solving dynamical and finite density problems. The first part of this talk focuses on the quantum simulation of the hadronic scattering process, including the initial state parton distribution functions, intermediate state partonic scattering amplitudes, and final state hadronization. The second part of this talk concentrates on the qubit encoding of Hamiltonian formalism in lattice gauge field theory with a Coulomb gauge. As a preliminary attempt, the qubit encoding of (3+1)-dimensional Coulomb gauge QED will be discussed.

会場: via Zoom

イベント公式言語: 英語

Coarse-graining black holes out of equilibrium with boundary observables on time slice

2024年4月1日(月) 16:00 - 17:30

竹田 大地 (京都大学 素粒子論研究室 博士課程)

In black hole thermodynamics, defining coarse-grained entropy for dynamical black holes has long been a challenge, and various proposals, such as generalized entropy, have been explored. Guided by the AdS/CFT, we introduce a new definition of coarse-grained entropy for a dynamical black hole in Lorentzian Einstein gravity. On each time slice, this entropy is defined as the horizon area of an auxiliary Euclidean black hole that shares the same mass, (angular) momenta, and asymptotic normalizable matter modes with the original Lorentzian solution. The entropy is shown to satisfy a generalized first law within Einstein theory and, through holography, the second law as well. This second law corresponds to the positivity of the relative entropy in the CFT. Furthermore, by applying this thermodynamics to several Vaidya models in AdS and flat spacetime, we discover a connection between the second law and the null energy condition.

会場: セミナー室 (359号室) (メイン会場) / via Zoom

イベント公式言語: 英語

Condensed Matter Physics of QCD 2024

2024年3月11日(月) - 22日(金)

ゴードン・ベイム (Professor Emeritus, University of Illinois, USA)
新田 宗土 (慶応義塾大学 教授)
Mark Alford (Professor, Washington University in St. Louis, USA)
Sanjay Reddy (Professor, University of Washington, USA)
Dam Thanh Son (Professor, The University of Chicago, USA)
Mikhail Stephanov (Professor, The University of Illinois at Chicago (UIC), USA)
福嶋 健二 (東京大学 大学院理学系研究科 物理学専攻 教授)
山本 直希 (慶応義塾大学)
久德 浩太郎 (京都大学 大学院理学研究科 准教授)
林 優依 (京都大学 基礎物理学研究所 学振特別研究員PD)
西村 健太郎 (広島大学)
古城 徹 (東北大学)
北沢 正清 (京都大学 基礎物理学研究所)

QCD at finite temperature and density is one of the most challenging problems in modern physics, which plays a crucial role to understand the origin and coevolution of the universe and matter. On the one hand, the relativistic heavy-ion collision experiments in the past decades have opened a new and exciting field to explore physical properties of such a QCD matter at high-tempearture. On the other hand, recent astrophysical observations of compact stars (in particular, events involving neutron stars) is becoming another exciting tool to unveil properties of the dense QCD matter. This molecule-type workshop is aimed at bringing together theorists working on QCD at finite-temperature and density, with a particular focus on dense quark-nuclear matter relevant to neutron star physics. We will mainly cover macroscopic properties of the finite-density QCD matter such as the Lee-Yang edge singularity for a QCD critical point, the renewed Fermi liquid theory for quark-nuclear matter, nuclear superfluidity, color superconductivity, quark-hadron continuity, quantum vortex, and transport phenomena including the weak-intearction processes.

会場: via Zoom / 京都大学基礎物理学研究所

イベント公式言語: 英語

Macroscopic neutrinoless double beta decay: long range quantum coherence

2024年3月6日(水) 15:30 - 17:30

ゴードン・ベイム (Professor Emeritus, University of Illinois, USA)

This talk will introduce the concept of ``macroscopic neutrinoless double beta decay" (MDBD) for Majorana neutrinos. In this process an antineutrino produced by a nucleus undergoing beta decay, $X\to Y + e^- + \bar \nu_e$, is absorbed as a neutrino by another identical $X$ nucleus via the inverse beta decay reaction, $\nu_e + X \to e^-+Y$. The distinct signature of MDBD is that the total kinetic energy of the two electrons equals twice the end-point energy of single beta decay. The amplitude for MDBD, a coherent sum over the contribution of different mass states of the intermediate neutrinos, reflects quantum coherence over macroscopic distances, and is a new macroscopic quantum effect. We discuss the similarities and differences between the MDBD and conventional neutrinoless double beta decay, as well as give estimates of the rates of MDBD and backgrounds.

会場: 研究本館 3階 359号室とZoomのハイブリッド開催 (メイン会場) / via Zoom

イベント公式言語: 英語

Stochastic tunneling in de Sitter spacetime

2024年2月28日(水) 16:00 - 17:30

宮地 大河 (神戸大学 大学院理学研究科 物理学専攻 宇宙論研究室 博士課程)

The formulation of tunneling in real time formalism is discussed. In the case of de Sitter spacetime, there is a method called the stochastic approach, which is known to reproduce the tunneling predicted by Hawking and Moss in the imaginary time formalism. In the case of accelerated expansion of space, the short-wavelength modes are stretched and transformed into long-wavelength modes. In the stochastic approach, such UV-IR transition is incorporated as quantum noise, and the dynamics of the long-wavelength modes are described by stochastic differential equations. In this talk, we construct a Schwinger-Keldysh path integral that reproduces this stochastic differential equation and reformulate the tunneling probability. We also reproduce the Hawking-Moss tunneling probabilities by using the saddle point approximation.

会場: セミナー室 (359号室) (メイン会場) / via Zoom

イベント公式言語: 英語

Using a trapped ion quantum computer for hamiltonian simulations

2024年2月28日(水) 10:30 - 12:00

リナルディ エンリコ (クオンティニュアム株式会社 Quantum Machine Learning and Algorithms Senior Research Scientist)

Trapped ion quantum computers, like the H-series quantum hardware by Quantinuum, robustly encode quantum information in long lived and precise qubits. However, utilizing the hardware efficiently requires a full-stack workflow from software libraries to hardware compilers. In this talk we introduce the relevant elements of this stack in the context of solving the quantum dynamics of a spin system on H-series hardware: we start from the definition of the Hamiltonian operator in the qubit Hilbert space using the open-source pytket python library and we define the quantum circuits in measurements to run, on a simulator first and on hardware later.

会場: セミナー室 (359号室) (メイン会場) / via Zoom

イベント公式言語: 英語

Second Workshop on Fundamentals in Density Functional Theory (DFT2024)

2024年2月20日(火) - 22日(木)

The density functional theory (DFT) is one of the powerful methods to solve quantum many-body problems, which, in principle, gives the exact energy and density of the ground state. The accuracy of DFT is, in practice, determined by the accuracy of an energy density functional (EDF) since the exact EDF is still unknown. Currently, DFT has been used in many communities, including nuclear physics, quantum chemistry, and condensed matter physics, while the fundamental study of DFT, such as the first principle derivations of an accurate EDF and methods to calculate many observables from obtained densities and excited states. However, there has been little opportunity to have interdisciplinary communication. On December 2022, we had the first workshop on this series (DFT2022) at Yukawa Institute for Theoretical Physics, Kyoto University, and several interdisiplinary discussions and collaborationd were started. To share such progresses and extend collaborations, we organize the second workshop. In this workshop, the current status and issues of each discipline will be shared towards solving these problems by meeting together among researchers in mathematics, nuclear physics, quantum chemistry, and condensed matter physics. This workshop mainly comprises lectures/seminars on cutting-edge topics and discussion, while a half-day session composed of contributed talks is also planned. This workshop is partially supported by iTHEMS-phys Study Group. This workshop is a part of the RIKEN Symposium Series. The detailed information can be found in the workshop website.

会場: 融合連携イノベーション推進棟（IIB） 8階 (メイン会場) / via Zoom

イベント公式言語: 英語

“Quantum-like Modeling” in Biology, Cognitive & Social Sciences

2024年1月26日(金) 9:30 - 17:00

近年、開放量子系(Open Quantum System)として生物・認知・社会現象をとらえて、それらの背後に潜む基本原理をいわゆる『Quantum-Like Modeling』をとおして数理的に定義することによって、これまで定性的な記述的論理構築に留まっていた現象を、厳密な定量解析の対象としようとする気運が熟そうとしている。そこで、関連する各分野での先端的な挑戦に着手している研究者による話題提供(15 分程度)と、数名の指定討論者によるコメント(5 分程度)を皮切りとした、参加者全員による自由闊達なブレーンストーミング(30 分程度)を企画した。各セッションでは、下記の様なごくおおまかな展望のもとに、参加者それぞれの研究の将来の発展可能性を大胆に広く探るような、胸躍る議論を期待したい。 プログラム 09:30~10:00 導入・背景(入來篤史・初田哲男) 導入1：開催趣旨(入來)−量子認知、Open Quantum System の黎明 導入2：RIKEN Quantum(初田)−量子計算の現状と展望 10:10~11:00 量子的現象(⻄郷甲矢人)：討論―小澤、江守 話題：JST-CREST 課題を中心に Open Quantum System 全体の概観を解説 討論：量子論的数理を用いた一般現象のモデリング・解釈の可能性と期待 11:10~12:00 新しい数学(小澤正直)：討論―小谷、初田 話題：非可換な順序効果の理論とブレークスルーにおける新しい数学理論 討論：実験家と数学者との相補的共働のデザインと「新しい数学」の創造 (昼休み) 13:30~14:20 生物学考察(磯村拓哉)：討論―桜田、石川 話題：ベイズ推論変分自由エネルギー原理における経路積分的手法 討論：生物学・脳神経科学・認知科学と精神医学における量子論的解釈 14:30~15:20 人文社会科学(田中彰吾)：討論―大村、池田 話題：原子論的人間観から量子メタファーによる人間と社会の理解へ 討論：人文社会科学における量子的現象と量子計算の社会実装の可能性 15:50~17:00 総合討論(司会・話題提供：入來篤史) 話題：「人間現象」の進化/歴史の経路積分・量子論的解釈と Quantum-Like Modeling 討論：フリー ブレーン ストーミング 登壇者(登壇順) 入來篤史 (CREST マルチセンシング領域 研究総括/理研 未来戦略室) 初田哲男 (理研 数理創造プログラム(iTHEMS)/CREST マルチセンシング領域 アドバイザー) ⻄郷甲矢人 (CREST マルチセンシング領域/⻑浜バイオ大学 フロンティアバイオサイエンス学科) 小澤正直 (理研 未来戦略室/中部大学 創発学術院 AI 数理データサイエンスセンター) 江守陽規 (理研 未来戦略室/北海道大学 工学部 光エレクトロニクス研究室) 小谷元子 (理研 数理創造プログラム(iTHEMS)/東北大学 理学部 数学科) 磯村拓哉 (CREST マルチセンシング領域/理研 脳神経科学研究センター 脳型知能理論研究ユニット) 桜田一洋 (AMED-CREST マルチセンシング領域 アドバイザー/理研 情報統合本部/慶應義塾大学医学部) 石川哲朗 (理研 情報統合本部 医療データ数理推論チーム/慶應義塾大学医学部 拡張知能医学講座) 田中彰吾 (CREST マルチセンシング領域/東海大学 文明研究所) 大村敬一 (放送大学 教養学部) 池田裕一 (京都大学 総合生存学館)

会場: 大河内記念ホール (メイン会場) / via Zoom

イベント公式言語: 日本語

Quantum Enhancement in Dark Matter Detection with Quantum Computation

2024年1月22日(月) 16:00 - 18:00

Thanaporn Sichanugrist (東京大学 大学院数理科学研究科 博士課程)
陳 詩遠 (東京大学 素粒子物理国際研究センター (ICEPP) 特任助教)

Title: Wave-like Dark Matter Search Using Qubits Abstract: The rapid controllability required for quantum computers makes the currently proposed quantum bit modalities also attractive as electromagnetic field sensors. One of the promising applications is wave-like dark matter searches, where the electric field converted from the coherent dark matter excites the qubits, leading to detectable signals [Phys. Rev. Lett. 131, 211001]. The quantum coherence between the qubits can be utilized to enhance the signal rate in a multi-qubit system. By designing an appropriate quantum circuit to entangle the qubits, it was found that the signal rate can scale proportionally to $n_q^2$, with $n_q$ being the number of sensor qubits, rather than linearly with $n_q$ [arXiv: 2311.10413]. In the seminar, we overview the theoretical framework of the search, elaborate on the signal-enhancing mechanism driven by quantum entanglement with specific examples of the quantum circuits, and discuss how the scheme can be implemented in the platform of future fault-tolerant quantum computers. We also provide the introduction of the experimental realization, and report the status of the experimental works carried out in UTokyo/ICEPP.

会場: via Zoom

イベント公式言語: 英語