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Abstract :
Combining the long coherence times available in microscopic quantum systems with the strong
interactions and integration available in solid state systems is one major goal in the recent study on
quantum information. For such purpose, much effort has been taken to propose and realize functional
hybrid quantum systems. In this presentation, I will introduce our recent theoretical works on this
field. We propose a spin-orbit qubit in a nanowire quantum dot on the surface of a multiferroic
insulator with a cycloidal spiralmagnetic order. The spiral exchange field from the multiferroic
insulator causes an inhomogeneous Zeeman-like interaction on the electron spin in the quantum dot,
producing a spin-orbit qubit. The absence of an external magnetic field benefits the integration of
such a spin-orbit qubit into high-quality superconducting resonators. By exploiting the Rashba spin-
orbit coupling in the quantum dot via a gate voltage, one can obtain an effective spin-photon
coupling with an efficient on-off switching. We also propose a hybrid system composed of a
Majorana qubit and a nanomechanical resonator, implemented by a spin-orbit-coupled
superconducting nanowire, using a set of static and oscillating ferromagnetic gates. The
ferromagnetic gates induce Majorana bound states in the nanowire, which hybridize and constitute a
Majorana qubit. Due to the oscillation of one of these gates, the Majorana qubit can be coherently
rotated. By tuning the gate voltage to modulate the local spin-orbit coupling, it is possible to reach
the resonance of the qubit-oscillatorsystem for relatively strong couplings.
报告人简介:张鹏,2007年获中国科学技术大学物理专业学士学位,
2013年获中国科学技术大学凝聚态物理专业博士学位。
2014-2016年在日本理化学研究所(RIKEN)做博士后研
究工作,并于2014年获日本学术振兴会外国人特别研究
员基金(JSPS Fellowship)。目前在日本乐天(Rakuten)
从事数据科学的研究工作。主要的研究方向包括:自旋
电子学、量子现象和混合量子器件设计、凝聚态理论。
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中南大学物理与电子学院
2016-12-5
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报告摘要:
介绍强流相对论电子束产生的原理、阴极制备、强流二极管的多种诊断,介绍电子束源中的物理和关键技术以及计算机粒子模拟。介绍强流电子束源的军事应用前景。介绍等离子体物理、脉冲功率技术、高电压技术与武器装备的联系。
报告人简介:
国防科技大学,教授,博士生导师,先后在以色列Technion和澳洲国立大学ANU作访问学者,主要从事定向能技术的研究和教学,发表100余篇学术论文和邀请报告,获军队科技进步一、二等奖各一项,军队育才奖银奖一项,发明专利两项,著作一部,研究生导师奖一项,是国家军口863项目和国家自然科学基金三项课题负责人。
欢迎大家参加!
欢迎大家参加!
欢迎大家参加!