Detecting Current Noise with a Josephson Junction in the Macroscopic Quantum Tunneling Regime

Details Detecting Current Noise with a Josephson Junction in the Macroscopic Quantum Tunneling Regime Detecting Current Noise with a Josephson Junction in the Macroscopic Quantum Tunneling Regime

2006-11-22

arxiv.org/abs/cond-mat/0611593v1

J. Low Temp. Phys. 146, 135 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

26 pages, 10 figures. To appear in Journal of Low Temperature Physics in the proceedings of the ULTI conference organized in L

Scientific paper

10.1007/s10909-006-9272-y

We discuss the use of a hysteretic Josephson junction to detect current fluctuations with frequencies below the plasma frequency of the junction. These adiabatic fluctuations are probed by switching measurements observing the noise-affected average rate of macroscopic quantum tunneling of the detector junction out of its zero-voltage state. In a proposed experimental scheme, frequencies of the noise are limited by an on-chip filtering circuit. The third cumulant of current fluctuations at the detector is related to an asymmetry of the switching rates.

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