Investigation of nonlinear effects in Josephson parametric oscillators used in circuit quantum electrodynamics
We experimentally study the behavior of a parametrically pumped nonlinear oscillator, which is based on a superconducting λ 4 resonator, and is terminated by a flux-tunable superconducting quantum interference device. We extract parameters for two devices. In particular, we study the effect of the n...
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Published in | New journal of physics Vol. 15; no. 10; pp. 105002 - 14 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
IOP Publishing
07.10.2013
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Subjects | |
Online Access | Get full text |
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Summary: | We experimentally study the behavior of a parametrically pumped nonlinear oscillator, which is based on a superconducting λ 4 resonator, and is terminated by a flux-tunable superconducting quantum interference device. We extract parameters for two devices. In particular, we study the effect of the nonlinearities in the system and compare to theory. The Duffing nonlinearity, α, is determined from the probe-power dependent frequency shift of the oscillator, and the nonlinearity, β, related to the parametric flux pumping, is determined from the pump amplitude for the onset of parametric oscillations. Both nonlinearities depend on the parameters of the device and can be tuned in situ by the applied dc flux. We also suggest how to cancel the effect of β by adding a small dc flux and a pump tone at twice the pump frequency. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1367-2630 1367-2630 |
DOI: | 10.1088/1367-2630/15/10/105002 |