报告题目：Advancing Quantum Information Science with Trapped Ions

报 告 人：金奇奂，清华大学物理系教授

报告时间：10月17日（周四） 14：30-15：30

报告地点：理学院郑裕彤大讲堂

内容摘要：

Within the Noisy Intermediate-Scale Quantum (NISQ) realm, an important milestone is showing quantum advantage - outperforming classical computers on specific problems. So far, boson sampling with photons and random circuit sampling with superconducting qubits have achieved this. Here, I present two paths we are exploring to reach similar quantum advantages with trapped ions.

First, we construct scalable phononic networks using the vibrational modes of trapped ions. We have realized a small-scale phonon sampler and shown this is an ideal testbed, since single phonons can be prepared and measured deterministically without loss - addressing key limitations of photonic systems [1].

Second, we have developed a trap capable of holding a 2D crystal of ions, demonstrating its equivalence to the standard linear ion chain for quantum simulation. Specifically, we achieved adiabatic ground state preparation for transverse Ising models with up to 10 ions [2]. We plan to scale up the number of ions to achieve quantum advantage. We will discuss the difficulties and our strategy for overcoming challenges towards this goal.

Finally, I’d like to discuss our experimental effort to show the quantum advantages in addressing a practical problem by combining the best part of quantum and classical computing using quantum error mitigation methods.

References
[1] Wentao Chen, et al., Nature Physics 19, 877 (2023).
[2] Mu Qiao, et al., Nature Physics 20, 623 (2024).

报告人简介：

Professor Kihwan Kim is a tenured professor in the Department of Physics, at Tsinghua University. He received his bachelor's, master's, and doctoral degrees from Seoul National University. He then did postdoctoral work at the University of Innsbruck and the University of Maryland. Since joining Tsinghua University in 2011, he has pursued the development of quantum computation and quantum information science using trapped ions. He also raised many talented students, and under his guidance, more than 10 students have already received doctoral degrees.