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Related Experiment Videos

Current to frequency conversion in a Josephson circuit.

F Nguyen1, N Boulant, G Ithier

  • 1Quantronics Group, Service de Physique de l'Etat Condensé (CNRS URA 2464), DSM/DRECAM/SPEC, CEA-Saclay, 91191 Gif-sur-Yvette, France.

Physical Review Letters
|November 13, 2007
PubMed
Summary
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Researchers demonstrate current-induced voltage oscillations in a quantronium circuit, a complex Josephson device. This current-to-frequency conversion offers potential for developing new metrology standards.

Area of Science:

  • Quantum computing and metrology
  • Superconducting quantum circuits

Background:

  • Josephson junctions exhibit voltage oscillations useful for current standards.
  • The Cooper pair box is a complex superconducting qubit with potential for novel applications.

Purpose of the Study:

  • To demonstrate current-induced voltage oscillations in a quantronium circuit.
  • To explore the potential of this phenomenon for metrology applications.

Main Methods:

  • Injecting a constant current into the gate capacitor of the quantronium.
  • Detecting oscillations via sidebands in a reflected microwave signal spectrum.

Main Results:

  • Observed oscillations at frequency f(B)=I/2e in the quantronium circuit.

Related Experiment Videos

  • Detected these oscillations up to injected currents exceeding 100 pA.

    • Conclusions:

    • The quantronium exhibits current-to-frequency conversion.
    • This phenomenon holds promise for advancing metrology standards.