Tolerance of programmable Josephson voltage standard to noise and junction nonuniformity

We developed a virtual model of a Josephson junction series array based on a rigorous dynamic simulation and investigated coupling effect of Josephson oscillations. Our virtual model for a superconductor-insulator-normal metal-insulator-superconductor junction array reveals that a time-lag junction instability should be avoided for global synchronization in a long array with a large number of junctions. We found that the coupling between the self-generated Josephson oscillations through a microwave transmission line plays an important role in the collective synchronization of the Josephson array.

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Simulations of collective synchronization in Josephson junction arrays

Kim

Chong

et al. 2006

Applied Physics Letters

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Margins of junction parameter spread for non-hysteretic Josephson junction arrays

Kim

Behr

Mueller

2003

Supercond. Sci. Technol.

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The programmable Josephson voltage standard shows robust step stability and is convenient for many metrological applications. The advantages of the programmable Josephson voltage standard are due to the array of non-hysteretic Josephson junctions with very high uniformity. We have numerically investigated the non-hysteretic Josephson junction arrays: externally shunted SIS (superconductor-insulator-superconductor) junctions and SINIS (superconductor-insulator-normal metal-insulator-superconductor) junction array. For the externally shunted SIS junction, we found the existence of an optimal range of the shunt inductance. For the SINIS junction array, the maximum tolerable nonuniformity of the junction parameters and the microwave power could be derived according to a tolerance criterion given in terms of the step width of the first Shapiro step. The simulation was also compared with an experimental observation for 1 V SINIS array with 8192 junctions.

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Tolerance of programmable Josephson voltage standard to noise and junction nonuniformity

Cited by 2 publications

References 8 publications

Simulations of collective synchronization in Josephson junction arrays

Simulations of collective synchronization in Josephson junction arrays

Margins of junction parameter spread for non-hysteretic Josephson junction arrays

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