报告题目：Diamond color centers for quantum repeater technologies

报告人：Youngik Sohn（孙永益）,韩国科学技术院（KAIST）

时间：2023年5月9日（周二）2:30-3:30

地点：电信学院3楼报告厅

摘要: The quantum network is one of the ultimate goals of emerging quantum technologies. It enables sharing of entangled qubits over a far distance. The most prominent application being developed at the moment is quantum key distribution (QKD), where the quantum property of the information carrier allows for the exchange of provably secure key distribution. However, its usable distance is limited to only a few hundred kilometers due to an inevitable trade-off between distance and key rate.

Fortunately, the quantum repeater is known to be a great platform to overcome this challenge by extending the distance between nodes. Over the past decade, nitrogen-vacancy (NV) centers in diamond have shown outstanding performance as quantum repeaters. However, when combined with nano-devices, their unstable nature presents an overwhelming challenge for practical deployment in real-life applications. As an alternative, the silicon-vacancy (SiV) color center is emerging as a potential solution. Thanks to its outstanding stability within nano-devices, it allows for near deterministic single photon - spin interactions that pave the way to practical quantum repeaters.

In this seminar, I will discuss the technical problems related to quantum repeater engineering by comparing two outstanding platforms for quantum repeaters.

 Youngik Sohn（孙永益），韩国科学技术院（ KAIST）助理教授， 2018年毕业于哈佛大学 Lončar课题组。他在博士研究中，率先将NEMS应用于钻石色心研究中以开发新的量子技术，包括电子自旋量子比特与声子的耦合，以及通过机械工程提升自旋的相干时间。博士毕业后， Young-Ik加入了资金最雄厚的量子计算初创公司之一 PsiQuantum，担任研发工程师，开发光子量子计算机。他于 2020年10月加入韩国科学技术院（ KAIST）担任全职教师。 他的研究重点是开发量子器件技术。 2023年1月24日，孙永益教授受邀参加韩国“青年科技领军人才与总统尹锡悦的对话并讨论了量子力学及技术的前景及支持计划”。