生物導航、可容錯量子計算、量子磁振子學、連續波激光器 | 本周物理講座

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報告人：丁世謙，清華大學

時間：3月17日（周二）10:00

單位：中國科學院理論物理研究所

地點：南樓6420

摘要:

The exceptionally low-energy isomeric transition in Th-229 at around 148 nm offers a unique opportunity for coherent nuclear control and the realization of an ultra-stable nuclear clock. Recent advances, most notably the incorporation of large ensembles of Th-229 nuclei in transparent crystals and the development of pulsed vacuum?ultraviolet (VUV) lasers, have enabled initial laser spectroscopy of this transition. However, the absence of an intense, narrow-linewidth VUV laser has been the critical missing element.

In this talk, I will present our proposal and experimental realization of the first continuous-wave laser at 148 nm, generated via four-wave mixing in cadmium vapor. Our source delivers more than 100 nW of power with a linewidth well below 100 Hz and supports broad wavelength tunability. We develop a spatially resolved homodyne technique to place a stringent upper bound on the phase noise induced by the nonlinear process and demonstrate sub-hertz linewidth capability. This development eliminates the final technical hurdle to a Th-229?based nuclear clock and opens new frontiers in quantum metrology, nuclear quantum optics and precision tests of fundamental physics.

報告人簡介:

丁世謙，清華大學物理系副教授，北京量子信息科學研究院兼聘研究員。2010年至2016年在新加坡國立大學量子技術中心學習，主要從事離子阱量子計算并獲博士學位。2016年至2021年在美國科羅拉多大學JILA研究所葉軍課題組開展博士后研究，聚焦分子激光冷卻。2021年赴德國慕尼黑大學Thirolf課題組訪問8個月。同年底加入清華大學物理系。研究方向為量子精密測量，重點開展釷-229原子核光鐘及核躍遷的激光操控研究。

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報告人：謝燦，杭州師范大學

時間：3月17日（周二）15:30

單位：中國科學院物理研究所

地點：M樓236會議室

摘要:

地磁場和重力場是地球自身產生的兩個最基本的物理場，整個生物系統的演化均在這樣的背景下進行。地球上的許多生物在幾十億年的進化過程中，發展出通過對微弱的地磁場信息（如磁極和磁傾角）的感知、解讀和利用，實現在海陸空不同空間、不同尺度上進行精確定向導航的非凡能力。生物導航原理是自然界中引人注目的未解之謎，也是生物學、物理學和工程學等多學科交叉的重要科學前沿問題，也是量子生物學的前沿核心領域之一。闡明生物分子如何在小度在家熱漲落劇烈的背景下實現對微弱地磁場的精準識別機制不僅讓我們理解生物導航的基本原理，讓我們在更廣闊的層面上去理解生物與各種弱物理場之間的相互作用，同時也為高靈敏度抗干擾的仿生磁傳感器和未來不依賴于衛星的新一代導航定位技術提供重要理論支撐。本次報告將回顧生物導航領域過去一百多年的研究歷史，分享我們實驗室的一些工作以及最新的進展，以及對該交叉領域未來的展望。

報告人簡介:

謝燦，國家科技創新領軍人才，九三學社社員。2001年博士畢業于中科院遺傳與發育生物學研究所，2009年從哈佛醫學院回國，歷任北京大學生命科學學院、中國科學院強磁場科學中心研究員，2024年赴浙江大學任求是特聘教授。2026 年 3 月加盟杭州師范大學，籌建量子生物學中心。

謝燦長期從事動物磁感應與生物導航基礎研究，是國際生物導航與量子生物學領域的代表人物。主要工作包括：首次發現一種動物對磁場感知的磁受體（MagR），提出動物磁導航的“生物指南針”模型，成為當前生物導航領域的三大主流模型之一，該工作當選為“2015年度中國生命科學領域十大進展”，并進入人教版高中生物學教材。2021年，與國際合作者共同提出動物磁導航的量子生物學原理（Nature，封面長文，共同通訊作者），被稱為動物磁感應領域與量子生物學領域的里程碑。2022年提出基于分子間長程電子轉移的動物磁導航“生物量子羅盤”新模型。這一系列工作為最終揭開動物如何感知微弱的地磁場進行長距離導航與精準定位之謎奠定了堅實的基礎，同時也為未來不依賴于衛星的新一代仿生量子導航定位技術上提供重要理論支撐和應用基礎。目前謝燦實驗室的主要研究方向包括：（1）動物磁導航的生物量子羅盤機制；（2）生物識別量子信息的機制；（3）生物弱場識別機制；（4）生物手性與生物導航的共性機制（與蔡甜甜課題組合作）。

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報告人：陳建鑫，清華大學

時間：3月18日（周三）9:30

單位：中國科學院理論物理研究所

地點：南樓6620

摘要:

A fundamental bottleneck in universal fault-tolerant quantum computing (FTQC) is the real-time decoding challenge: classical error processing must stay ahead of physical noise to prevent a catastrophic error “backlog”. For over a decade, achieving sub-microsecond latency on scalable superconducting processors has remained a significant hurdle.

I will present our team’s multi-year journey toward solving these critical constraints, centered on two complementary pillars: a cutting-edge neural decoding algorithm and the robust hardware-software architecture required to support it at scale.

報告人簡介:

Jianxin Chen (陳建鑫) is a tenured associate professor in the Department of Computer Science and Technology at Tsinghua University. His recent research focuses on the system design and implementation of quantum computers, as well as quantum error correction and fault tolerance. He earned his Bachelor of Science (2005) and Doctor of Philosophy (2010) degrees in Computer Science from Tsinghua University. Subsequently, he conducted postdoctoral research at the Institute for Quantum Computing, University of Waterloo / University of Guelph (Canada), and the Joint Center for Quantum Information and Computer Science (QuICS), University of Maryland, College Park (USA). Prior to joining the Department of Computer Science and Technology at Tsinghua University in March 2025, he led R&D efforts for both the systems team and the North American team at the Alibaba Quantum Laboratory.

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報告人：Prof T?nu Pullerits, Lund University

時間：3月18日（周三）9:30

單位：北京大學物理學院

地點：物理樓中樓215

摘要:

Optical microcavities provide a powerful platform to tailor light–matter interactions and control excitation dynamics in molecular systems. When excitonic materials are embedded in Fabry–Pérot cavities, hybrid light–matter states (polaritons) emerge and reshape relaxation pathways. Using photosynthetic light-harvesting complexes as a model system, we show that cavities modify excitation relaxation and inter-complex energy transfer. In the strong-coupling regime, population dynamics are governed by redistribution between polaritonic branches and dark states, altering lifetimes and transfer efficiencies, while even weak coupling can enhance transfer through cavity-mediated connectivity. We further discuss plexcitons formed by coupling molecular excitons to plasmonic resonances, where interference between electric and magnetic dipolar modes can mimic Rabi splitting. Examples including photonic crystal slabs and chiral plasmonic systems show how nanophotonic environments can enhance nonlinear responses and engineer excitation relaxation and energy transport.

報告人簡介:

T?nu Pullerits earned his PhD in 1991 from the Institute of Physics at Tartu University, Estonia. He conducted postdoctoral research at the Free University of Amsterdam (1992–1993) and Ume? University (1993–1994), before joining Lund University in 1994. He is currently a full professor and deputy head of the Division of Chemical Physics at Lund. Since 2016, he has been an elected member of the Royal Swedish Academy of Sciences. His research focuses on energy transport in molecular systems, ultrafast charge carrier dynamics and photophysics in photovoltaic materials, strong light–matter interactions, and coherent multidimensional spectroscopy.

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報告人：任赫辰，天津大學

時間：3月18日（周三）15:00

單位：北京大學物理學院

地點：西563會議室

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報告人：侯爵，倫敦國王學院

時間：3月19日（周四）10:00

單位：中國科學院理論物理研究所
地點：南樓6620

摘要:

The TTbar deformation is a class of solvable irrelevant deformations of 2d QFTs, defined by flowing along the composite operator constructed from the components of the stress tensor. TTbar deformations have attracted significant interest due to their intriguing properties, such as preserving integrability, exhibiting solvable thermodynamics, and admitting a holographic dual description in AdS3/CFT2. The partition functions of TTbar deformed theories on a torus are known to be modular invariant and to obey a flow equation. We solve the flow equation via harmonic analysis and obtain a model-independent expression. Then, by imposing the spectral decomposition on the specific case of the undeformed compact free boson, we derive the explicit form of its TTbar deformed partition function.

報告人簡介:

Jue Hou is a postdoctoral researcher at King's College London. He obtained his PhD in physics from Peking University and subsequently held a postdoctoral position at Southeast University. His research focuses on integrability, with specific interests in integrable spin chains and integrable deformations of QFTs, including the TTbar deformation.

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報告人：Peng Wang，中國科學院上海天文臺

時間：3月19日（周四）15:30

單位：北京大學物理學院

地點：KIAA-auditorium

摘要:

Angular momentum is a key quantity linking the formation of galaxies to the dynamics of the cosmic web. Building on a series of recent observational and theoretical works, this talk will present a picture of how angular momentum is generated, transported and reprocessed across scales—from megaparsec-scale filaments, through galaxy clusters, down to individual galaxies. I will first show how large-scale cosmic filaments can host measurable spin, and how a well-defined characteristic radius provides a robust dynamical boundary for these structures. I will then demonstrate that galaxy clusters act as an intermediate “bridge” in this cosmic dance: using new observational estimators, we can detect statistically significant rotation in clusters and establish systematic alignments between cluster spin, filament axes, and the spins of brightest central galaxies. Finally, I will discuss a two-phase model of galaxy angular momentum evolution, in which galaxies initially acquire spin via laminar accretion perpendicular to filaments and later undergo spin reorientation through mergers and anisotropic inflows along filaments, naturally explaining the observed spin–filament alignment flip with mass and time. Together, these results map out a coherent multi-scale pathway for angular momentum transfer in the Universe, from large-scale structure to the internal dynamics of galaxies.

報告人簡介:

Dr. Peng Wang is a Researcher at the Shanghai Astronomical Observatory (SHAO), CAS. He received his Ph.D. in Astronomy from Purple Mountain Observatory (PMO), CAS, in January 2019. From 2019 to 2022, he worked as a postdoctoral researcher at the Leibniz Institute for Astrophysics Potsdam (AIP), Germany. In March 2022, he joined SHAO as a faculty member. Dr. Wang was selected for the CAS Pioneer Hundred Talents Program (Category B). His research focuses on large-scale structure of the Universe, galaxy formation, and the spatial distribution of satellite galaxies. He has published over 40 papers, including ~20 as first or corresponding author in leading journals such as Nature Astronomy, ApJL/ApJ, MNRAS. Dr. Wang is PI or co-PI on multiple projects funded by the NSFC. He has also been supported by talent programs including the Shanghai XSC Program, Shanghai Pujiang Talent Program, and Shanghai Rising-Star Program (A-class).

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報告人：游建強，浙江大學物理學院

時間：3月19日（周四）16:00

單位：清華大學物理系

地點：物理樓W105

摘要:

Quantum magnonics has emerged as a new direction of research in both quantum physics and condensed matter physics. This talk introduces the background in this area and the very recent progress in my group. First, I will demonstrate the quantum control of a single magnon, including the deterministic generation of a single-magnon state and its coherent superposition with the vacuum (zero-magnon state). Second, I will show some new results on magnon squeezing in the quantum regime, a novel phenomenon in quantum nonlinear magnonics.

報告人簡介:

游建強，浙江大學物理學院求是特聘教授，研究領域為量子物理。1984年7月在湘潭大學物理系獲學士學位，1988年8 月在中國科學院金屬研究所獲碩士學位，1997年7月在中國科學院固體物理研究所獲博士學位。曾任北京計算科學研究中心講座教授、復旦大學物理系謝希德冠名教授等。2003 年獲日本理化學研究所 (RIKEN) 前沿研究頭等獎,2006 年獲國家杰出人才基金，2008 年入選教育部特聘教授，2016年入選國家領軍人才。其關于超導電路與量子信息的論文，在2025年諾貝爾物理學獎官方科學背景文件中被列為 27 篇關鍵論文之一。曾任美國物理學會 Physical Review Applied 雜志編委，現任德國 Springer 出版社 Quantum Information Processing 雜志編委和美國物理聯合會 APL Quantum 雜志副主編。

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報告人：Prof. Chengtian Lin, Max Planck Institute for Solid State Research, Stuttgart, Germany

時間：3月20日（周五）10:00

單位：中國科學院物理研究所

地點：M236會議室

摘要:

This presentation traces the historical development of high-temperature superconductors, focusing on significant materials classes such as cuprates, cobaltates, iron pnictides, chalcogenides, topological insulators, and nickelates. Starting with the groundbreaking discovery of cuprate superconductors, we will explore their complex structures and unique superconducting phases. The discussion will then move to cobaltates, emphasizing the effects of water doping on their superconducting properties. Iron pnictides and chalcogenides will be examined with a focus on their preparation methods and superconducting characteristics. The talk will also cover the intriguing intersection of topological insulators and super-conductors, highlighting phenomena such as vertices and peak effects. Finally, we will delve into the emerging field of nickelate superconductors, outlining their potential and current research challenges. The presentation aims to provide a thorough understanding of the advancements in high-temperature superconductors and their future prospects.

報告人簡介:

Education and work experience: Master: IOP CAS, PhD: MIT, Post Dr. and Research Associate at Cambridge University, Professor and former head of crystal growth group at Max Planck Institute for Solid State Research, Stuttgart, Germany, Honorary Professor at Kunming University of Science and Technology, Adjunct professor at Shanghai University, Visiting Prof. at IOP, CAS.

封面圖片來源：https://gc.sjtu.edu.cn/cn/off-the-press-zh/2022-10-08/133744/

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