报告题目：Digital Quantum Simulation for Energy Spectroscopy: Schwinger and Ising Models

报 告 人：Dongwook Ghim

报告时间：2026年5月14日 14：00 

报告地点：597-627-1726 Meeting Password: 522897

内容摘要：Recent advances in quantum computation offer a promising path to explore quantum field theories, circumventing the sign problem inherent in classical Monte Carlo methods. As an example of such an application, this talk will introduce a novel quantum algorithm for energy spectroscopy, directly inspired by the 'coherent imaging' technique demonstrated by C.Senko et al. (2014). The proposed method extracts the excited-state energy spectrum by applying a periodically oscillating perturbation (quench) to the ground state and by identifying the resonance frequencies where the vacuum-to-vacuum probability drops significantly after the quench. This talk demonstrates how this intuitive spectroscopy approach is naturally implemented in digital quantum simulation. I will use the (1+1)-dimensional Schwinger model with a topological term and the Ising model on a periodic chain as explicit examples. The talk will cover the detailed procedure of the algorithm, such as adiabatic ground state preparation and Suzuki-Trotter time evolution. I will discuss the computational efficiency, practical potential, and drawbacks of this algorithm in the upcoming era of early fault-tolerant quantum computers.

报告人简介：Recent advances in quantum computation offer a promising path to explore quantum field theories, circumventing the sign problem inherent in classical Monte Carlo methods. As an example of such an application, this talk will introduce a novel quantum algorithm for energy spectroscopy, directly inspired by the 'coherent imaging' technique demonstrated by C.Senko et al. (2014). The proposed method extracts the excited-state energy spectrum by applying a periodically oscillating perturbation (quench) to the ground state and by identifying the resonance frequencies where the vacuum-to-vacuum probability drops significantly after the quench. This talk demonstrates how this intuitive spectroscopy approach is naturally implemented in digital quantum simulation. I will use the (1+1)-dimensional Schwinger model with a topological term and the Ising model on a periodic chain as explicit examples. The talk will cover the detailed procedure of the algorithm, such as adiabatic ground state preparation and Suzuki-Trotter time evolution. I will discuss the computational efficiency, practical potential, and drawbacks of this algorithm in the upcoming era of early fault-tolerant quantum computers.