Interqubit coupling mediated by a high-excitation-energy quantum object. S. Ashhab, A. O. Niskanen, K. Harrabi, Y. Nakamura, T. Picot, P. C. de Groot, C. J. P. M. Harmans, J. E. Mooij and Franco Nori in Phys. Rev. B 77:014510 (2008).