Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session U17: Hybrid Systems - Electromechanics, Optomechanics
2:30 PM–4:42 PM,
Thursday, March 5, 2020
Room: 203
Sponsoring
Unit:
DQI
Chair: Charlotte Boettcher, Harvard University
Abstract: U17.00010 : Nonclassical energy squeezing with quadratic electromechanics
Presenter:
Xizheng Ma
(University of Colorado, Boulder)
Authors:
Xizheng Ma
(University of Colorado, Boulder)
Jeremie Viennot
(Univ. Grenoble Alpes, CNRS, Institut NĂ©el)
Shlomi Kotler
(National Institute of Standards and Technology Boulder)
John Teufel
(National Institute of Standards and Technology Boulder)
Konrad Lehnert
(University of Colorado, Boulder)
Collaboration:
xizheng research assistant ma
mechanical oscillators and microwave or optical light relies on a linearized interaction that limits possible quantum effects. To go beyond this limitation, we quadratically couple the displacement of a mechanical oscillator to the energy levels of a superconducting charge qubit[1]. Through microwave frequency drives that change both the state of the oscillator and the qubit, we dissipatively stabilize the oscillator in a non-classical state with a large mean phonon number of 43 and sub-Poissonian number fluctuations of approximately 3. In this number squeezed state, we observe a striking feature of the quadratic coupling, the two phonon recoils of the mechanical oscillator due to qubit transitions. These are closely analogous to the vibronic transitions in molecules, heralding entry into a new regime of artificial systems with fast electrons coupled strongly to slow vibrations.
[1] Viennot, J. J., Ma, X. & Lehnert, K. W. Phonon-Number-Sensitive Electromechanics. PRL121, 183601(2018)
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