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Direct observation of Josephson capacitance.

M A Sillanpää1, T Lehtinen, A Paila

  • 1Low Temperature Laboratory, Helsinki University of Technology, FIN-02015 HUT, Finland.

Physical Review Letters
|December 31, 2005
PubMed
Summary

We measured the effective capacitance in a split Cooper-pair box (CPB), revealing insights into its band structure. This method also enables efficient, nondemolition readout of the CPB quantum state.

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Area of Science:

  • Quantum Computing
  • Solid-State Physics
  • Superconductivity

Background:

  • The Cooper-pair box (CPB) is a fundamental superconducting qubit.
  • Understanding its capacitive properties is crucial for quantum information processing.
  • Accurate characterization methods are needed for qubit control and readout.

Purpose of the Study:

  • To measure the effective capacitance of a split Cooper-pair box (CPB).
  • To investigate the relationship between capacitance and the CPB band structure.
  • To demonstrate a novel method for nondemolition quantum state readout.

Main Methods:

  • Low-frequency reactive measurement scheme employed.
  • Measurement performed across the phase-gate bias plane of the CPB.

Related Experiment Videos

  • Capacitive susceptibility probed, linked to CPB band structure.

    • Main Results:

    • Effective capacitance successfully measured.
    • Data quantitatively explained using independently determined spectroscopic parameters.
    • Demonstrated efficient nondemolition readout of the CPB quantum state.

    Conclusions:

    • The low-frequency measurement scheme effectively probes CPB band structure.
    • Spectroscopic parameters provide quantitative explanation of capacitive data.
    • The developed method is efficient for nondemolition qubit readout.