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Related Experiment Videos

Persistent supercurrent atom chip.

T Mukai1, C Hufnagel, A Kasper

  • 1NTT Basic Research Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan.

Physical Review Letters
|August 7, 2007
PubMed
Summary
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Researchers developed a novel thermal switch for controlling supercurrents in superconducting circuits. This innovation enables precise management of magnetic fields for trapping Rubidium-87 atoms.

Area of Science:

  • Atomic Physics
  • Condensed Matter Physics
  • Superconductivity

Background:

  • Trapping neutral atoms requires precise magnetic field control.
  • Superconducting circuits offer a pathway to generate stable magnetic potentials.
  • Controlling supercurrents in these circuits is crucial for applications.

Purpose of the Study:

  • To develop an on-chip method for controlling supercurrents in a superconducting loop.
  • To enable precise generation of Ioffe-Pritchard potentials for atom trapping.
  • To demonstrate a versatile thermal switch for superconducting circuit applications.

Main Methods:

  • Fabrication of a molecular-beam epitaxy-grown MgB2 superconducting loop on a sapphire substrate.
  • Integration of a laser-controlled on-chip thermal switch.

Related Experiment Videos

  • Utilizing the switch to modulate a 2.5 A supercurrent for magnetic field generation.

    • Main Results:

    • Demonstrated on/off switching of the supercurrent.
    • Showcased the ability to set the supercurrent to specific values using an external magnetic field.
    • Achieved current control even without an external source during current decrease.

    Conclusions:

    • The developed thermal switch provides effective control over supercurrents in superconducting circuits.
    • This method allows for precise generation and modulation of magnetic fields for atom trapping.
    • The technology holds promise for advancements in quantum technologies and precision measurements.