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Achieving the threshold regime with an overscreened Josephson junction.

Eugene V Sukhorukov1, Andrew N Jordan

  • 1Départment de Physique Théorique, Université de Genève, CH-1211 Genève 4, Switzerland.

Physical Review Letters
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

Researchers used an overscreened Josephson junction as a noise detector to measure current distribution tails. This method, using a low-impedance circuit, creates a tunable barrier, altering activation rates beyond the standard Arrhenius form.

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Area of Science:

  • Quantum electronics
  • Mesoscopic physics

Background:

  • Josephson junctions are sensitive to quantum fluctuations.
  • Measuring current distribution tails requires specific experimental conditions.

Purpose of the Study:

  • To demonstrate an overscreened Josephson junction as a noise detector.
  • To achieve and measure the threshold regime of current fluctuations.

Main Methods:

  • Utilizing an overscreened Josephson junction as a noise detector.
  • Placing the junction and mesoscopic conductor in a low-impedance external circuit.
  • Operating in the underdamped limit.

Main Results:

  • Achieved the threshold regime for measuring fluctuating current distribution tails.
  • Overscreening inhibited energy diffusion, creating a tunable activation barrier.
  • Observed an activation rate qualitatively different from the Arrhenius form.

Conclusions:

  • Overscreened Josephson junctions are effective noise detectors.
  • The tunable activation barrier offers new control over quantum phenomena.
  • This work challenges conventional models of activation rates in dissipative systems.