Phys. Rev. Lett. 102, 086806 (2009) [4 pages]Achieving the Threshold Regime with an Overscreened Josephson JunctionReceived 26 August 2008; published 26 February 2009 We demonstrate that by utilizing an overscreened Josephson junction as a noise detector it is possible to achieve the threshold regime, whereby the tails of the fluctuating current distribution are measured. This situation is realized by placing the Josephson junction and mesoscopic conductor in an external circuit with very low impedance. In the underdamped limit, overscreening the junction inhibits the energy diffusion in the junction, effectively creating a tunable activation barrier to the dissipative state. As a result, the activation rate is qualitatively different from the Arrhenius form. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.086806
DOI:
10.1103/PhysRevLett.102.086806
PACS:
73.23.−b, 05.40.−a, 72.70.+m, 74.50.+r
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