學術報告 133
題目: [表面科學論壇(133)] Ultra-high kinetic inductance superconducting materials from spinodal decomposition
時間: 2022年08月25日 10:00
地點: 騰訊會議
報告人: 高然

阿里巴巴達摩院量子實驗室

騰訊會議:831-165-219

報告摘要:

Disordered superconducting nitrides with kinetic inductance have long been considered to be leading material candidates for high-inductance quantum-circuit applications (i.e., fluxonium qubits, photon detectors, etc.). Despite continuing efforts toward reducing material dimensions or altering material chemistries to increase the kinetic inductance and the corresponding circuit impedance, achieving further improvements without compromising material quality has become a fundamental challenge. In this talk, I will discuss a method developed at Alibaba Quantum Laboratory to drastically increase the kinetic inductance of superconducting materials while maintaining a reasonably low microwave loss. We use epitaxial Ti0.48Al0.52N films as a model system and utilize spinodal decomposition to trigger the insulator-to-superconductor transition in such materials with a drastically enhanced chemical and structural disorder. The measured kinetic inductance increases by two to three orders of magnitude compared with the best disordered superconducting nitrides reported to date. We believe this work has demonstrated the feasibility of substantially enhancing and deterministically controlling the kinetic inductance of nitride-based superconductors for advanced superconducting quantum circuits. In the end, I will also discuss the implementation of such materials in the construction of fluxonium qubits.

報告人簡介
高然博士現任阿里巴巴達摩院量子實驗室量子科學家,主要負責低損耗超導量子芯片的研發及制備、量子比特退相干機理研究、以及適用于高精度量子芯片的新材料體系的開發。高然博士本科畢業于復旦大學材料物理專業,2014年獲得美國伊利諾伊大學香檳分校材料科學碩士學位,2019年博士畢業于美國加利福尼亞大學伯克利分校。高然博士有多年的外延薄膜材料生長、材料結構及物性表征、以及微納芯片制備工藝的經驗。

邀請人:劉 淼 副研究員(9407)

聯系人:張 萃 副研究員(8609)