报告题目:光悬浮纳米粒子的扭动光力学与量子模拟
报 告 人:尹璋琦 助理研究员(清华大学量子信息中心)
报告时间:2017年6月16日(星期五),下午3:30
报告地点:bwin必赢国际官网APP六层学术报告厅(致知楼3623-3624)
报告摘要:
An optically levitated nanoparticle in vacuum is aparadigm optomechanical system for sensing andstudying macroscopic quantum mechanics. Whileits center-of-mass motion has been investigated in-tensively, its torsional vibration has only been stud-ied theoretically in limited cases. Here we re-port the first experimental observation of the tor-sional vibration of an optically levitated nonspher-ical nanoparticle in vacuum. We achieve this byutilizing the coupling between the spin angular mo-mentum of photons and the torsional vibration ofa nonspherical nanoparticle whose polarizability isa tensor. The torsional vibration frequency canbe one order of magnitude higher than its center-of-mass motion frequency, which is promising forground state cooling. We propose a simple yetnovel scheme to achieve ground state cooling of itstorsional vibration with a linearly-polarized Gaus-sian cavity mode. A levitated nanao-diamond withbuilding-in Nitrogen-vacancy centers is also suit-able for generating multipartite quantum entangle-ment and simulating many-body spins models. Wewill briefly discuss it in the last of the talk.
参考文献:Phys. Rev. Lett. 117, 123604 (2016), arXiv:1611.05599
报告人简介:
尹璋琦,1999至2009年在西安交通大学获得物理学学士,硕士和博士学位,曾在美国密西根大学、中国科学技术大学等地从事科研工作。从2012年起,他在清华大学交叉信息研究院量子信息中心任助理研究员。研究兴趣包括量子信息的物理实现方案、光力学等。已在Nat. Phys.、Phys. Rev. Lett. 等学术刊物上发表论文四十余篇。据Google Scholar检索,论文已被引用1200余次,h指数18。有3篇论文入选ESI高引用论文,其中有1篇被中国科学技术信息研究所评为“2007年中国百篇最具影响力国际学术论文”。曾获2015年陕西省科学技术一等奖(第六完成人),西安交通大学优秀博士论文奖等。
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2017年6月13日