Probing High Frequency Noise with Macroscopic Resonant Tunneling

A.J. Berkley; D.V. Averin; E. Ladizinsky; E. Tolkacheva; F. Altomare; J. Johansson; M.H.S. Amin; M.W. Johnson; P. Bunyk; R. Harris

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Probing High Frequency Noise with Macroscopic Resonant Tunneling

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arxiv 1103.1931 v1 pith:VW3GNREX submitted 2011-03-10 cond-mat.supr-con

T. Lanting , M.H.S. Amin , M.W. Johnson , F. Altomare , A.J. Berkley , S. Gildert , R. Harris , J. Johansson

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P. Bunyk E. Ladizinsky E. Tolkacheva D.V. Averin

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classification cond-mat.supr-con

keywords noisedensityspectraltunnelingcomponentmacroscopicohmicresonant

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We have developed a method for extracting the high-frequency noise spectral density of an rf-SQUID flux qubit from macroscopic resonant tunneling (MRT) rate measurements. The extracted noise spectral density is consistent with that of an ohmic environment up to frequencies ~ 4 GHz. We have also derived an expression for the MRT lineshape expected for a noise spectral density consisting of such a broadband ohmic component and an additional strongly peaked low-frequency component. This hybrid model provides an excellent fit to experimental data across a range of tunneling amplitudes and temperatures.

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