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Center for Astrophysics Research and Technologies Seminar Series Information


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Playing quantum noise on a nanomechanical string

Thursday September 6, 2018
3:30 pm

 Presenter:  Dalziel Wilson, University of Arizona
 Series:  CQuIC Seminars
 Abstract:  Nanomechanical resonators are exquisite force sensors and have recently been used to “feel” the
vacuum fluctuations of a laser field. I’ll describe a system consisting of a glass nanostring coupled
to an optical microcavity and how it has been used to not only sense radiation pressure shot noise,
but also to squeeze it, to feedback-cool a vibration of the string to near its ground state, and to
witness its zero-point energy as motional sideband asymmetry—all long-standing goals in the field
of optomechanics. Underlying these advances are new insights into dissipation of nanomechanical
resonators. Combining strain and mode-shape engineering, it is now possible to realize resonators
with effective masses of picograms, frequencies of megahertz, and quality factors approaching 1
billion at room temperature. These numbers spark the imagination, inviting speculation about
applications ranging from atomic force microscopy to tests of quantum collapse models.

[1] R. Schilling, H. Sch¨utz, A. Ghadimi, V. Sudhir, D. J. Wilson, and T. J. Kippenberg, Phys. Rev. App. 5, 054019 (2016).
[2] D. Wilson, V. Sudhir, N. Piro, R. Schilling, A. Ghadimi, and T. Kippenberg, Nature 524, 325 (2015)
[3] V. Sudhir, D. J. Wilson, R. Schilling, H. Sch¨utz, S. A. Fedorov, A. H. Ghadimi, A. Nunnenkamp, and T. J. Kippenberg,
Phys. Rev. X 7, 011001 (2017)
[4] V. Sudhir, R. Schilling, S. A. Fedorov, H. Schuetz, D. J. Wilson, and T. J. Kippenberg, Phys. Rev. X 7, 031055 (2017)
[5] A. H. Ghadimi, S. A. Fedorov, N. J. Engelsen, M. J. Bereyhi, R. Schilling, D. J. Wilson, and T. J. Kippenberg, Science
360, 764 (2018).
 Host:  Ivan Deutsch
 Location:  Room 190, Physics & Astronomy

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