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Colloquium: Exploring quantum measurement with nanomechanics and light

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Dalziel Wilson, École Polytechnique Fédérale de Lausanne
When
22 February 2018 from 3:45 PM to 4:45 PM
Where
117 Osmond Laboratory
Contact Name
David Weiss
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Nanomechanical resonators are exquisite force sensors.  In a new generation of experiments, they have even been used to “feel” the vacuum fluctuations of a laser field.  This talk addresses the other side of the coin: can the same laser be used to “see” the vacuum fluctuations of the mechanical resonator?  If so, can such a measurement be leveraged to cool a tangibly-sized mechanical object to its ground state, using feedback?  I will describe an experiment designed to achieve both goals, based on a nanostring coupled to an optical microcavity.  Along the way, I will describe a position measurement with an imprecision 40 dB below that at the standard quantum limit, a technique to squeeze light by reflecting it from a mirror, and how this effect can be used to increase the resolution of a force sensor (including a gravitational wave detector).  I will also briefly describe a new class of nanomechanical resonators with room temperature quality factors exceeding 100 million. These devices undergo 100s of coherent oscillations before interacting with the thermal environment, and may enable new optomechanics-based quantum technologies.

 

References:

D. Wilson et. al., Nature 524, 325 (2015)

R. Schilling et. al., Phys. Rev. App. 5, 054019 (2016)

V. Sudhir et. al., Phys. Rev. X 7, 011001 (2017)

V. Sudhir et. al., Phys. Rev. X 7 (3), 031055 (2017)

A. Ghadimi et. al., arXiv:1711.06247 (2017)

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