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恒元物理學(xué)講座(第089期):光懸浮納米粒子的扭動(dòng)光力學(xué)與量子模擬

發(fā)布時(shí)間:2017-06-16 瀏覽:

講座題目:恒元物理學(xué)講座(第089期):光懸浮納米粒子的扭動(dòng)光力學(xué)與量子模擬

講座人:尹璋琦 助理研究員

講座時(shí)間:15:30

講座日期:2017-6-16

地點(diǎn):長(zhǎng)安校區(qū) 物理學(xué)與信息技術(shù)學(xué)院六層學(xué)術(shù)報(bào)告廳(致知樓3623-3624)

主辦單位:物理學(xué)與信息技術(shù)學(xué)院

講座內(nèi)容:An optically levitatednanoparticle in vacuum is aparadigm optomechanical system for sensingandstudying macroscopic quantum mechanics. Whileits center-of-mass motion hasbeen investigated in-tensively, its torsional vibration has only been stud-iedtheoretically in limited cases. Here we re-port the first experimentalobservation of the tor-sional vibration of an optically levitated nonspher-icalnanoparticle in vacuum. We achieve this byutilizing the coupling between thespin angular mo-mentum of photons and the torsional vibration ofa nonsphericalnanoparticle whose polarizability isa tensor. The torsional vibration frequencycanbe one order of magnitude higher than its center-of-mass motion frequency,which is promising forground state cooling. We propose a simple yetnovel schemeto achieve ground state cooling of itstorsional vibration with alinearly-polarized Gaus-sian cavity mode. A levitated nanao-diamondwithbuilding-in Nitrogen-vacancy centers is also suit-able for generatingmultipartite quantum entangle-ment and simulating many-body spins models.Wewill briefly discuss it in the last of the talk.

參考文獻(xiàn):Phys. Rev. Lett. 117, 123604 (2016), arXiv:1611.05599

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