物理学院学术报告（第12期）

报告题目：Exponentially Reduced Circuit Depths in Lindbladian Simulation

报告专家：余文峻  香港大学

报告时间：2025年04月14日（周一）10: 00

报告地点：理6栋302      邀请人：张笑鸣

报告内容：

Quantum computers promise efficient simulation of open quantum systems through Lindbladian dynamics, enabling powerful applications in quantum chemistry, autonomous error correction, and state preparation. However, unlike closed-system simulation, simulating Lindbladian dynamics on digital quantum computers remains challenging due to the intrinsic requirement for non-unitary operations. Existing methods face a critical trade-off: either requiring resource-intensive multi-qubit operations with experimentally challenging approaches or relying on deep quantum circuits to suppress simulation errors using experimentally friendly methods. In this work, we challenge this perceived trade-off by proposing an efficient Lindbladian simulation framework based on the linear combination of superoperators. Our approach achieves an exponential reduction in circuit depth while requiring only two ancilla qubits and straightforward Trotter decomposition. Furthermore, we extend this framework to time-dependent Lindbladian dynamics, achieving logarithmic circuit depths for the first time. Rigorous numerical simulations demonstrate significant advantages over existing techniques, providing a practical and scalable solution for open system simulation on near-term quantum devices.

专家简介：

Wenjun Yu (余文峻) is a PhD candidate in the Department of Computer Science at the University of Hong Kong under the supervision of Prof. Qi Zhao（赵琦） and Giulio Chiribella. Before that, he received his Bachelor's degree from “Yao Class”(“姚班”), Tsinghua University. Wenjun's research interests lie in the field of quantum computing, with a focus on quantum algorithm design and system certification. Thus far, he has published peer-reviewed papers in leading journals such as PRX Quantum, and some of the work has been selected for oral presentation at prestigious conferences, including TQC.