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Related Experiment Videos

Spectroscopy on two coupled superconducting flux qubits.

J B Majer1, F G Paauw, A C J Ter Haar

  • 1Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.

Physical Review Letters
|March 24, 2005
PubMed
Summary

We measured spectroscopy on two coupled flux qubits, observing resonances that confirm their inductive coupling. The measured coupling strength matches theoretical mutual inductance calculations.

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Area of Science:

  • Quantum Computing
  • Solid State Physics

Background:

  • Flux qubits are a type of superconducting quantum bit.
  • Inductive coupling is a common method for connecting qubits.

Purpose of the Study:

  • To perform spectroscopy on two inductively coupled flux qubits.
  • To observe and quantify the coupling strength between the qubits.

Main Methods:

  • Utilized microwave radiation to induce transitions between energy states.
  • Performed spectroscopy measurements to analyze qubit resonances.
  • Varied applied magnetic field to study resonance shifts.

Main Results:

  • Observed distinct resonances corresponding to ground-to-first and ground-to-second excited states.

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  • Confirmed qubit coupling through the analysis of resonance positions versus magnetic field.
  • Measured coupling strength aligns with theoretical predictions based on mutual inductance.

    • Conclusions:

    • The study successfully characterized the inductive coupling of two flux qubits.
    • Spectroscopy is an effective method for probing qubit interactions.
    • Experimental results validate theoretical models of coupled superconducting qubits.