學術報告
題目: [拓撲量子計算卓越創新中心-物理所聯合報告] Tunable superconducting coupling of quantum dots via Andreev bound states: theory and experiment
時間: 2022年06月14日 16:00
地點: 騰訊會議
報告人: Dr. Chun-Xiao Liu (劉純驍)

Delft University of Technology, the Netherlands

騰訊會議 417-839-609 會議密碼:0614

Abstract: 
Semiconductor quantum dots have proven to be a useful platform for quantum simulation in the solid state. However, implementing a superconducting coupling between quantum dots mediated by a Cooper pair has so far suffered from limited tunability and strong suppression. This has limited applications such as Cooper pair splitting and the quantum dot simulation of topological Kitaev chains. In this talk, I will introduce our proposal of mediating tunable effective couplings via Andreev bound states in a semiconductor-superconductor nanowire connecting two quantum dots. In this way it is possible to individually control both the coupling mediated by Cooper pairs and by single electrons by changing the properties of the Andreev bound states with easily accessible experimental parameters. In addition, the problem of coupling suppression is greatly mitigated. I will also talk about the most recent experimental progress following this proposal.

References:
1. arXiv:2203.00107(theory) C.-X. Liu, G. Wang, T. Dvir, and M. Wimmer (2022)
2. arXiv:2205.03458(experiment) G. Wang, T. Dvir, G.P. Mazur, C.-X. Liu, et. al. (2022)