- Speaker:
- Xiao Yuan (袁骁), Peking University
- Title:
- Quantum advantage for near-term and fault-tolerant quantum computers
- Time:
- 16:00 ~ 17:30 (Beijing Time)
- Venue:
- Shuangqing-B627
- Online:
- Zoom 293 812 9202 (BIMSA)
- Abstract:
Quantum computers have the potential to solve classically intractable problems. However, realizing a universal quantum computer is challenging with current technology. Before having a fully-fledged quantum computer, a more realistic question is what we can do with current and near-term quantum hardware. In this talk, I will first review the quantum algorithms that are designed for near-term and fault-tolerant quantum computers. Then, I will introduce our recent works about classical simulation of quantum processes. Finally, we discuss the possibility of achieving quantum advantages in the early-fault tolerant era.
Speaker Intro:
Dr. Xiao Yuan received his Bachelor in theoretical physics from Peking University in 2012 and got his PhD in physics from Tsinghua University in 2016. Then he worked as a postdoc at University of Science and Technology China in 2017, at Oxford University from 2017 to 2019, and at Stanford University from 2019 to 2020. He is now an assistant professor at Center on Frontiers of Computing Studies, Peking University. Dr. Xiao Yuan’s current research interests focus on near-term and universal quantum computing, and their applications.
- Speaker:
- Jiehang Zhang (张颉颃), BIMSA
- Title:
- Quantum Computing Hardware Platforms: A Focus on Neutral Atoms and Trapped Ions
- Time:
- 16:00 ~ 17:30 (Beijing Time)
- Venue:
- Shuangqing-B627
- Online:
- Zoom 230 432 7880 (BIMSA)
- Abstract:
- Quantum computing is rapidly advancing, with diverse hardware platforms vying to overcome the challenges of scalability, coherence, and error correction. This talk provides an overview of the leading quantum computing hardware platforms, with a particular focus on neutral atoms and trapped ions—two of the most promising approaches in the field. Neutral atom systems leverage ultra-cold atoms trapped in optical tweezers, offering excellent scalability and long coherence times, while trapped ions utilize precisely controlled atomic ions confined by electromagnetic fields, achieving high-fidelity gate operations and low error rates. We will compare the strengths and challenges of these platforms, highlighting recent breakthroughs in qubit control, entanglement generation, and error correction. By exploring the unique advantages of neutral atoms and trapped ions, this talk aims to provide a gentle peek into their potential to enable scalable, fault-tolerant quantum computing.
- Speaker:
- Guilu Long (龙桂鲁), Tsinghua University, Beijing Academy of Quantum Information Sciences
- Title:
- 信息安全的量子矛和盾
- Time:
- 16:11 ~ 16:11 (Beijing Time)
- Venue:
- Shuangqing-B627
- Online:
- Zoom 230 432 7880 (BIMSA)
- Abstract:
2022 年中国学者提出的量经融合大数分解算法，在近期量子硬件即可尝试破译RSA，引起广泛关注，产生重大影响。量子通信是 “盾”，为信息安全提供新的保护方法。在量子密钥分发快速发展的同时，量子安全直接通信（QSDC）技术也取得快速发展，建立了高噪声下安全通信理论，实现了光纤和空间实验演示，完成了城域、城际和网络三个里程碑系统，并在银行和 5G 专网试用。本报告将介绍近期的进展。
龙桂鲁，清华大学教授，北京量子信息科学研究院副院长。杰出青年基金获得者，英国物理学会和美国物理学会会士，中国通信学会量子通信委员会主任，中国密码学会理事和量子密码专委会副主任，IUPAP量子科技组委员，中央X委某部XX组副组长。长期从事量子计算和通信研究，发表 论文400 余篇，谷歌学术引用 29000 余次，荣获国家自然科学奖二等奖、IBM 全球杰出学者奖、中国电子学会科技奖一等奖等多项殊荣。
Gui-Lu Long is a professor at Tsinghua University & Deputy-President of Beijing Academy of Quantum Information Sciences. He is fellow of IoP and APS. Notably among his contributions, he proposed the quantum secure direct communication that transmits information directly; constructed the Grover-Long algorithm for exact search and the full quantum eigensolver; and established the widely used linear combination unitaries method for quantum algorithm designs. He proposed the WISE interpretation of quantum mechanics. He published 300+ papers with 20000+ citations. He was President of AAPPS and vice-chair of C13 of IUPAP.
- Speaker:
- Rundi Lv (卢润迪), Tsinghua University
- Title:
- Infinite-dimensional Extension of the Linear Combination of Hamiltonian Simulation: Theorems and Applications
- Time:
- 16:00 ~ 17:30 (Beijing Time)
- Venue:
- Shuangqing-B627
- Online:
- Zoom 230 432 7880 (BIMSA)
- Abstract:
- We generalize the Linear Combination of Hamiltonian Simulation (LCHS) formula [An, Liu, Lin, Phys. Rev. Lett. 2023] to simulate time-evolution operators in infinite-dimensional spaces, including scenarios involving unbounded operators. This extension, named Inf-LCHS for short, bridges the gap between finite-dimensional quantum simulations and the broader class of infinite-dimensional quantum dynamics governed by partial differential equations (PDEs). Furthermore, we propose two sampling methods by integrating the infinite-dimensional LCHS with Gaussian quadrature schemes (Inf-LCHS-Gaussian) or Monte Carlo integration schemes (Inf-LCHS-MC). We demonstrate the applicability of the Inf-LCHS theorem to a wide range of non-Hermitian dynamics, including linear parabolic PDEs, queueing models (birth-or-death processes), Schr¨odinger equations with complex potentials, Lindblad equations, and black hole thermal field equations. Our analysis provides insights into simulating general linear dynamics using a finite number of quantum dynamics and includes cost estimates for the corresponding quantum algorithms.
- Speaker:
- Jiazhong Hu (胡嘉仲), Tsinghua University
- Title:
- Probing many-body correlations via non-equilibrium dynamics
- Time:
- 16:00 ~ 17:30 (Beijing Time)
- Venue:
- Shuangqing-B627
- Online:
- Zoom 230 432 7880 (BIMSA)
- Abstract:
In this talk, I will elaborate on our recent experimental advancements in probing many-body correlations through non-equilibrium dynamics. By making use of a loss channel, we observe a universal dissipative dynamic in one-dimensional strongly-correlated quantum gases. This universal dynamic furnishes us with information regarding the anomalous dimension of the system, which is arduous to measure by conventional means. Through non-adiabatic ramping, we can probe the critical regions that lack a well-defined quasi-particle description. Based on non-adiabatic ramping, we have developed an integrable formula to depict the measured observables, and the results go beyond the conventional account of the Kibble-Zurek mechanism. These methods significantly enrich the approaches to measuring a quantum system and can be further extended to diverse systems for extracting different types of many-body correlations.
Speaker Intro:
博士毕业于麻省理工学院，现清华物理系副教授，主要从事于基于超冷原子的量子计算实验工作，发表过2篇Science、1篇Nature、3篇Nature Physics等。