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Dephasing of solid-state qubits at optimal points.

Yuriy Makhlin1, Alexander Shnirman

  • 1Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe, Germany.

Physical Review Letters
|June 1, 2004
PubMed
Summary

We analyzed noise effects on two-level systems in Josephson-junction circuits. Nonlinear coupling to 1/f noise significantly impacts system dynamics, revealing crucial higher-order effects.

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Area of Science:

  • Quantum Computing and Superconducting Circuits
  • Quantum Information Science
  • Condensed Matter Physics

Background:

  • Josephson-junction circuits are key experimental platforms for studying quantum phenomena.
  • Understanding noise sources is critical for maintaining quantum coherence in two-level systems.
  • Linear coupling to low-frequency fluctuations is often suppressed at optimal operating points.

Purpose of the Study:

  • To investigate the impact of various noise sources on the dynamics of two-level systems.
  • To analyze decoherence arising from nonlinear (quadratic) coupling, specifically 1/f and Ohmic noise.
  • To explore the influence of higher-order effects in the presence of 1/f noise.

Main Methods:

  • Theoretical analysis of two-level system dynamics.
  • Modeling noise sources with 1/f and Ohmic power spectra.
  • Focus on nonlinear (quadratic) coupling mechanisms.

Main Results:

  • Decoherence is significantly influenced by nonlinear coupling to noise.
  • 1/f noise exhibits strong higher-order effects impacting system evolution.
  • Ohmic noise also contributes to decoherence in these systems.

Conclusions:

  • Nonlinear coupling, particularly to 1/f noise, presents a significant challenge for quantum coherence in Josephson-junction circuits.
  • Higher-order effects associated with 1/f noise must be considered for accurate modeling and control.
  • These findings are relevant for the design and operation of quantum devices based on two-level systems.

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