Noise-induced dephasing of an ac-driven Josephson junction

Details Noise-induced dephasing of an ac-driven Josephson junction Noise-induced dephasing of an ac-driven Josephson junction

2002-03-28

arxiv.org/abs/nlin/0203060v1

Nonlinear Sciences

Pattern Formation and Solitons

latex text file and six eps figure files. Physical Review E, in press

Scientific paper

10.1103/PhysRevE.65.051116

We consider phase-locked dynamics of a Josephson junction driven by finite-spectral-linewidth ac current. By means of a transformation, the effect of frequency fluctuations is reduced to an effective additive noise, the corresponding (large) dephasing time being determined, in the logarithmic approximation, by the Kramers' expression for the lifetime. For sufficiently small values of the drive's amplitude, direct numerical simulations show agreement of the dependence of the dephasing activation energy on the ac-drive's spectral linewidth and amplitude with analytical predictions. Solving the corresponding Fokker-Planck equation analytically, we find a universal dependence of a critical value of the effective phase-diffusion parameter on the drive's amplitude at a point of a sharp transition from the phase-locked state to an unlocked one. For large values of the drive amplitude, saturation and subsequent decrease of the activation energy are revealed by simulations, which cannot be accounted for by the perturbative analysis. The same new effect is found for a previously studied case of ac-driven Josephson junctions with intrinsic thermal noise. The work was performed in the framework of a cooperation agreement between Consiglio Nazionale di Ricerca (Italy) and the Israeli Ministry of Science and Technology.

Affiliated with

Also associated with

No associations

Rating

Noise-induced dephasing of an ac-driven Josephson junction does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Noise-induced dephasing of an ac-driven Josephson junction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise-induced dephasing of an ac-driven Josephson junction will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-240567