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Two coupled Josephson junctions: dc voltage controlled by biharmonic current.

L Machura1, J Spiechowicz, M Kostur

  • 1Institute of Physics, University of Silesia, Katowice, Poland.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|January 27, 2012
PubMed
Summary
This summary is machine-generated.

This study shows how coupled Josephson junctions can rectify AC current to produce DC voltage. Researchers can control these voltages by adjusting system parameters and coupling strength.

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Area of Science:

  • Condensed matter physics
  • Quantum electronics

Background:

  • Josephson junctions exhibit unique quantum mechanical tunneling effects.
  • Coupling superconducting circuits can lead to novel transport phenomena.

Purpose of the Study:

  • To investigate the rectification properties of two coupled Josephson junctions.
  • To explore the generation and control of DC voltages in such a system.

Main Methods:

  • Theoretical study of two serially coupled Josephson junctions.
  • Applying a two-harmonic AC current to one junction.
  • Analyzing the influence of shunt resistance on DC voltage generation.

Main Results:

  • The device rectifies AC current, producing a DC voltage across the first junction.
  • A DC voltage can be generated across the second junction via coupling.
  • System parameters like relative phase and frequency allow efficient manipulation of DC voltages, enabling sign reversal.

Conclusions:

  • Coupled Josephson junctions offer a tunable platform for DC voltage generation.
  • The system demonstrates efficient control over rectified voltages through parameter variation.
  • This work has implications for superconducting electronics and metrology.