Enhancing Optomechanical Coupling via the Josephson Effect

Loading...
Thumbnail Image
Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2014
Major/Subject
Mcode
Degree programme
Language
en
Pages
203603/1-6
Series
Physical Review Letters, Volume 112, Issue 20
Abstract
Cavity optomechanics is showing promise for studying quantum mechanics in large systems. However, the smallness of the radiation-pressure coupling is a serious hindrance. Here we show how the charge tuning of the Josephson inductance in a single-Cooper-pair transistor can be exploited to arrange a strong radiation-pressure-type coupling g0 between mechanical and microwave resonators. In a certain limit of parameters, such a coupling can also be seen as a qubit-mediated coupling of two resonators. We show that this scheme allows reaching extremely high g0. Contrary to the recent proposals for exploiting the nonlinearity of a large radiation-pressure coupling, the main nonlinearity in this setup originates from a cross-Kerr type of coupling between the resonators, where the cavity refractive index depends on the phonon number. The presence of this coupling will allow accessing the individual phonon numbers via the measurement of the cavity.
Description
Keywords
cavity optomechanical systems, Josephson effect, vibrations, electromagnetic fields, micromechanical resonators
Other note
Citation
Heikkilä, T. T. & Massel, F. & Tuorila, J. & Khan, R. & Sillanpää, Mika A. 2014. Enhancing Optomechanical Coupling via the Josephson Effect. Physical Review Letters. Volume 112, Issue 20. 203603/1-6. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.112.203603.