【学术视频】2019年量子物理青年学者论坛 | 哥本哈根大学陈骏昕

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图 | 陈骏昕

题   目：Quantum Optomechanics with a Soft-Clamped Membrane-in-the-Middle System

报告人：陈骏昕

单   位：University of Copenhagen

时   间：2019-08-24

地   点：山西大学

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报告摘要

The field of optomechanics was founded by the pioneers of LIGO, who were exploring the limit of interferometric displacement measurement. According to Heisenberg uncertainty principle, measurement inevitably perturbs the state of the test mass, which is called backaction. Backaction will be evident in the measurement record, when the interaction between meter and test mass is strong enough. After half-century of effort, some optomechanical systems have finally reached this interesting regime. This opens the gate to a rich quantum world on meso/ macroscopic objects, such as observation of quantum fluctuation, backaction evasion measurement, preparation of non-classical states of mechanics and optics, realizing quantum transducer, test of fundamentals of quantum mechanics, and even observation of low energy signatures of quantumgravity.
One of the biggest challenges in quantum experiments in meso/ macroscopic scale, compared to atomic scale counter parts, is the fast decoherence of the quantum state. We address this challenge with a technique called soft-clamping. Putting a soft-clamped mechanical resonator in a Fabry–Pérot cavity, we have a membrane-in-the-middle system. With the system, we have achieved the first feedback cooling of a mechanical mode to its quantum ground state, observed the first quantum trajectory of mechanical motion, conducted the first displacement and force measurement below the standard quantum limit, and entangled two optical fields through optomechanical interaction. In this talk, I will introduce the basics of optomechanics, and talk about the results mentioned above.

个人简介

陈骏昕，在香港科技大学获学士学位，而后于苏黎世联邦理工学院获得物理学硕士学位。现于哥本哈根大学尼尔斯·波尔研究所攻读博士学位，师从Prof. Dr. Albert Schliesser，专攻量子光机，并对各类量子光学技术有广泛的兴趣。目前与合作者共著有三篇论文。

会议简介

会议名称：2019年量子物理青年学者论坛

会议时间：8月23日-25日

会议地点：山西大学光电研究所

会议主办方：山西大学

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