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Stabilized parametric cooper-pair pumping in a linear array of coupled Josephson junctions.

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Summary
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We developed a stabilized charge pumping technique for Cooper-pair boxes that minimizes errors like current reversal. This quantum Zeno effect method advances metrology and the measurement triangle closure.

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Area of Science:

  • Quantum Computing
  • Solid-State Physics
  • Metrology

Background:

  • Accurate charge pumping is crucial for quantum information processing and metrology.
  • Existing charge pumping schemes face challenges with errors such as current reversal and charge excitation.
  • The measurement triangle in quantum metrology requires precise charge transfer standards.

Purpose of the Study:

  • To present an experimentally feasible stabilized charge pumping scheme.
  • To enhance the accuracy and reliability of charge pumping mechanisms.
  • To contribute to the closure of the quantum measurement triangle.

Main Methods:

  • Utilizing a linear array of Cooper-pair boxes.
  • Implementing an intrinsically protected pumping design.
  • Applying the quantum Zeno effect to suppress errors.

Main Results:

  • Demonstrated a stabilized charge pumping scheme with inherent error protection.
  • Significantly reduced errors, including current reversal and spontaneous charge excitation.
  • The scheme shows potential for improving current metrological standards.

Conclusions:

  • The proposed charge pumping scheme is experimentally realizable and robust.
  • It offers a pathway to higher precision in charge transfer measurements.
  • This work is relevant for advancing quantum metrology and fundamental physics.