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Related Experiment Videos

Magnetic phase shifter for superconducting qubits.

D S Golubović1, W V Pogosov, M Morelle

  • 1Nanoscale Superconductivity and Magnetism Group, Laboratory for Solid State Physics and Magnetism, K. U. Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium.

Physical Review Letters
|June 1, 2004
PubMed
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Researchers developed a contactless magnetic phase shifter for superconducting qubits. This device uses a magnetized dot to precisely control phase shifts, enabling new applications in quantum circuits and vortex studies.

Area of Science:

  • Quantum Computing
  • Superconducting Circuits
  • Magnetism

Background:

  • Flux-based superconducting qubits are crucial for quantum computation.
  • Controlling phase shifts in superconducting circuits is essential for qubit manipulation.
  • Existing methods for phase shifting can be complex or invasive.

Purpose of the Study:

  • To design and investigate a novel contactless magnetic phase shifter.
  • To enable arbitrary phase shifts in superconducting loops.
  • To explore applications in quantum circuits and fractional Josephson vortices.

Main Methods:

  • A perpendicularly magnetized dot was placed at the center of a superconducting loop.
  • The magnetic flux from the dot was used to induce shielding currents.

Related Experiment Videos

  • Parameters of the magnetic dot were modified to control the induced phase shift.

    • Main Results:

    • A functional contactless magnetic phase shifter was successfully designed and tested.
    • The device demonstrated the ability to generate tunable phase shifts.
    • The induced shielding current in the loop was directly linked to the magnetic dot's properties.

    Conclusions:

    • The developed magnetic phase shifter offers a non-invasive method for controlling superconducting qubit states.
    • This technology can serve as an external current source in superconducting circuits.
    • The phase shifter is a valuable tool for investigating fractional Josephson vortices and related quantum phenomena.