Report Title: Toward Scalable and Fault-Tolerant Quantum Networks: A Unified Framework for Entanglement Distillation and Quantum Repeaters
Speaker: Dr. Shi Yu (Postdoctoral Fellow at the University of Maryland)
Host: Professor Zhang Yuran
Report time: 16:00 p.m. on December 24, 2025 (Wednesday)
Report location: Academic Lecture Hall, Room 213, 2nd Floor, Physics Building (Building 18)
Hosting unit: School of Physics and Optoelectronics
Abstract:
This talk presents a unified theoretical framework for entanglement distillation and quantum repeaters, forming a foundation for scalable and fault-tolerant quantum networks. I will first introduce stabilizer entanglement distillation [1], which connects entanglement distillation directly to stabilizer quantum error correction, unifying previous approaches and guiding the systematic design of improved protocols. Building on this framework, I will present a measurement-based quantum repeater architecture that relies solely on locally prepared graph states and Bell measurements [2], greatly reducing circuit complexity and resource overhead. When implemented with quantum low-density parity-check (QLDPC) codes, the repeater achieves constant-rate, fault-tolerant Bell state distribution over arbitrary distances—a key step toward scalable quantum networks.
[1] Y. Shi, A. Patil, S. Guha, PRX Quantum 6, 010339 (2025).
[2] Y. Shi, A. Patil, S. Guha, Phys. Rev. Lett. 135, 130803 (2025).
Introduction to the presenter:
Shi Yu is a postdoctoral fellow at the School of Electrical and Computer Engineering, University of Maryland. He obtained his Ph.D. from the University of Maryland in 2023 and has conducted postdoctoral research at the National Science Foundation Engineering Research Center - Quantum Network Center at the University of Arizona and the University of Maryland. His research focuses on quantum information theory, including quantum error correction, entanglement purification, quantum repeater, and quantum network. He has published multiple papers in international journals such as Physical Review Letters, PRX Quantum, and Physical Review A, dedicated to scalable and fault-tolerant quantum communication and computing theory.
