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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Josephson current in strongly correlated double quantum dots.

Rok Zitko1, Minchul Lee, Rosa López

  • 1J. Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.

Physical Review Letters
|September 28, 2010
PubMed
Summary

This study explores Josephson currents in double quantum dots, revealing a π-phase island when superconductivity, Kondo physics, and exchange interactions compete. This finding is crucial for understanding quantum phenomena in superconducting devices.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Computing
  • Superconductivity

Background:

  • Josephson currents are fundamental to superconducting electronics.
  • Quantum dots offer tunable platforms for studying electron interactions.
  • Kondo physics and superexchange interactions significantly influence electronic properties.

Purpose of the Study:

  • Investigate Josephson current and 0-π transitions in a serial double quantum dot system.
  • Analyze the interplay between superconductivity, Kondo physics, and interdot superexchange.
  • Map the phase diagram of 0 and π-junction regimes under varying conditions.

Main Methods:

  • Tuning the ratio of superconducting gap (Δ) to Kondo temperature (T(K)).
  • Varying superexchange coupling (J) via interdot tunneling (t) and level broadening (Γ).
  • Analyzing the renormalization of interdot tunneling and the role of superexchange.

Main Results:

  • Observed strong renormalization of interdot tunneling (t).
  • Demonstrated a significant role for superexchange coupling (J).
  • Revealed a rich phase diagram with distinct 0 and π-junction regimes.

Conclusions:

  • A π-phase island emerges when superconductivity, exchange interaction, and Kondo physics are in strong competition (Δ∼J∼T(K)).
  • The findings highlight the complex phase behavior in interacting quantum dot systems.
  • This work provides insights into controlling quantum states in superconducting circuits.