1304.3693 (G. Tancredi et al.)

Bifurcation, mode coupling and noise in a nonlinear multimode
superconducting RF resonator    [PDF]

G. Tancredi, G. Ithier, P. J. Meeson

The addition of a 7-SQUID array to a thin film superconducting coplanar waveguide resonator introduces a controlled, tunable, nonlinear inductance that strengthens effects analogous to the Kerr effects in quantum optics. Exploiting the self-Kerr effect in one resonant mode, we create a sensitive bifurcation amplifier and then demonstrate spectroscopy of other resonant modes by simultaneously employing the cross-Kerr effect. We find that the sensitivity of the device approaches quantitative agreement with a quantum model by Dykman, but is limited by a noise that has its source(s) on-chip.

View original: http://arxiv.org/abs/1304.3693