报告题目

Diamond color centers for quantum repeaters

报 告 人

Prof. Youngik Sohn，School of Electrical Engineering, KAIST

报告地点

物理楼中楼215

报告时间

2023年5月16日 (星期二)15:00-17:00

联 系 人

肖云峰(Tel: 62765512)

报告摘要

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.

报告人简介

Prof. Youngik Sohn is an assistant professor in the School of Electrical Engineering at Korea Advanced Institute of Science and Technology (KAIST).He studied Electrical Engineering for his Bachelor’s and Master’s degrees from Seoul National University and Stanford University, respectively. In 2018, he received Ph.D. degree in Applied Physics from Harvard University by his pioneering contribution to developing MEMS technology for quantum emitters in diamond.Aftergraduation, he has joined an early phase startup calledPsiQuantum, which now is one of the leading quantum computer manufacturers in the world.After joining KAIST in2020,hecontinuestowork on chip-scale quantum technologies.