Enhancement of the optomechanical coupling and Kerr nonlinearity using the Josephson capacitance of a Cooper-pair box
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2022-04-01
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en
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15
1-15
1-15
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Physical Review B, Volume 105, issue 14
Abstract
We propose a scheme for enhancing the optomechanical coupling between microwave and mechanical resonators by up to seven orders of magnitude to the ultrastrong coupling limit in a circuit optomechanical setting. The tripartite system considered here consists of a Josephson junction Cooper-pair box that mediates the coupling between the microwave cavity and the mechanical resonator. The optomechanical coupling can be modified by tuning the gate charge and the magnetic flux bias of the Cooper-pair box which in turn affect the Josephson capacitance of the Cooper-pair box. We additionally show that with a suitable choice of tuning parameters, the optomechanical coupling vanishes and the system purely exhibits a cross-Kerr type of nonlinearity between the cavity and the mechanical resonator. This allows the system to be used for phonon counting.Description
| openaire: EC/H2020/670743/EU//QuDeT | openaire: EC/H2020/722923/EU//OMT | openaire: EC/H2020/824109/EU//EMP Funding Information: We thank Andreas Hüttel, Yuriy Makhlin, Francesco Massel, and Tero Heikkilä for useful discussions. This work was supported by the Academy of Finland Center of Excellence Quantum Technology Finland (Grant No. 312295) and RADDESS program (Grant No. 314448, BOLOSE), as well as by the European Research Council (Grant No. 670743). M.T.H. acknowledges support from the European Union's Horizon 2020 program for research and innovation under Grant Agreement No. 722923 (Marie Curie ETN-OMT) and a three-month-long secondment at University of Camerino, during which part of the work was carried out. J.M. thanks the support of the Vilho, Yrjö and Kalle Väisälä Foundation of the Finnish Academy of Science and Letters. This work was also supported in part by COST Action CA16218 (NANOCOHYBRI) and the European Microkelvin Platform (EMP, No. 824109). Publisher Copyright: © 2022 American Physical Society.
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Manninen, J, Haque, M T, Vitali, D & Hakonen, P 2022, ' Enhancement of the optomechanical coupling and Kerr nonlinearity using the Josephson capacitance of a Cooper-pair box ', Physical Review B, vol. 105, no. 14, 144508, pp. 1-15 . https://doi.org/10.1103/PhysRevB.105.144508