Enhancing optomechanical coupling via the Josephson effect

T. T. Heikkilä, F. Massel, J. Tuorila, R. Khan, M. A. Sillanpää

Research output: Contribution to journalArticlepeer-review

106 Citations (Scopus)


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.

Original languageEnglish
Article number203603
JournalPhysical Review Letters
Issue number20
Publication statusPublished - 23 May 2014
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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