Probing High Frequency Noise with Macroscopic Resonant Tunneling

Details Probing High Frequency Noise with Macroscopic Resonant Tunneling Probing High Frequency Noise with Macroscopic Resonant Tunneling

2011-03-10

arxiv.org/abs/1103.1931v1

PRB 83 180502 (2011)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.83.180502

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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