报告题目: |
Coherent coupling of a superconducting flux qubit to an electron spin ensemble in diamond |
报告人: |
朱晓波 |
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日本NTT基础物性研究所
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报告时间: |
2011-12-23 10:00 |
报告地点: |
信息（FIT） 楼 1-415 会议室 |
主办单位: |
国家实验室 |
简介: |
During the past decade, research into superconducting quantum bits (qubits) based on Josephson junctions has made rapid progress. Many foundational experiments have been performed, and superconducting qubits are now considered one of the most promising systems for quantum information processing. However, the experimentally reported coherence times are likely to be insufficient for future large-scale quantum computation. A natural solution to this problem is a dedicated engineered quantum memory based on atomic and molecular systems. The question of whether coherent quantum coupling is possible between such natural systems and a single macroscopic artificial atom has attracted considerable attention since the first demonstration of macroscopic quantum coherence in Josephson junction circuits. Here we report evidence of coherent strong coupling between a single macroscopic superconducting artificial atom (a gap tunable flux qubit[1]) and an ensemble of electron spins in the form of nitrogen–vacancy colour centres in diamond. Furthermore, we have observed coherent exchange of a single quantum of energy between a flux qubit and a macroscopic ensemble consisting of about 3.3e7 such color centres. This is the first step towards the realization of a long-lived quantum memory and hybrid devices coupling microwave and optical systems[2].
[1] “Coherent operation of a gap-tunable flux qubit” Xiaobo Zhu, et al. APPLIED PHYSICS LETTERS, Volume: 97, Issue: 10 pp. 102503 (2010)
[2] “Coherent coupling of a superconducting flux qubit to an electron spin ensemble in diamond” Xiaobo Zhu, et al., Nature, Volume: 478, 221-224 (2011)
报告人简历：朱晓波，男，1976年10月生。1998年毕业于吉林大学获得学士学位。2003年毕业于中国科学院物理研究所并获得博士学 位。毕业后在中国科学院物理研究所留所工作。2007年被中科院物理所聘任为副研究员。2008年加入日本NTT基础物性研究所工作至今。多 年来主要从事超导量子比特以及超导约瑟夫森结系统的研究。近期重要的研究成果包括：1）通过改进传统超导磁通性量子比特的设计，获得了能隙可 调的，退相干时间达到微妙量级的能隙可调型磁通量子比特(APL, 97, pp.102503, 2010)。世界上首次成功地将该种超导量子比特系统与一个电子自旋集体模（Ensemble of nitrogen–vacancy color centres in diamond）系统相干耦合(Nature, 478, P.221–224,2011)。该项工作实验上开启了长寿命固态量子存储器这一新的研究方向。2）系统的研究了超小铌结的位相扩散行为，首次明确观测到 量子区域的位相扩散现象(PRL, 107, pp. 067004, 2011)。3）以及早期一系列的关于Bi2Sr2CaCu2O8+δ单晶表面本征约瑟夫森结的性质，结的自热效应，结的宏观量子隧穿效应的研究。
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