Parametric amplification with weak-link nonlinearity in superconducting microresonators

Details Parametric amplification with weak-link nonlinearity in superconducting microresonators Parametric amplification with weak-link nonlinearity in superconducting microresonators

2009-06-15

arxiv.org/abs/0906.2744v2

Physics

Condensed Matter

Superconductivity

Submitted to Physica Scripta, topical issue: Nobel Symposium on Quantum Bits, 2009. 10 pages, 5 figures. Version 2 contains a

Scientific paper

Nonlinear kinetic inductance in a high Q superconducting coplanar waveguide microresonator can cause a bifurcation of the resonance curve. Near the critical pumping power and frequency for bifurcation, large parametric gain is observed for signals in the frequency band near resonance. We show experimental results on signal and intermodulation gain which are well described by a theory of the parametric amplification based on a Kerr nonlinearity. Phase dependent gain, or signal squeezing, is verified with a homodyne detection scheme.

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