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Field-Effect Controllable Metallic Josephson Interferometer.

Federico Paolucci1,2, Francesco Vischi2,3, Giorgio De Simoni2

  • 1INFN Sezione di Pisa , Largo Bruno Pontecorvo 3 , I-56127 Pisa , Italy.

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|August 29, 2019
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Summary
This summary is machine-generated.

Researchers developed titanium-based Josephson junctions (JJs) allowing independent voltage tuning. This breakthrough offers full control over superconducting phase and switching current amplitude, advancing quantum technologies.

Keywords:
SQUIDcomputingfield-effectsuperconductivity

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Area of Science:

  • Superconducting electronics
  • Quantum device engineering

Background:

  • Gate-tunable Josephson junctions (JJs) are crucial for superconducting classical and quantum computation.
  • Current JJs often use low-charge-concentration materials, limiting scalability and presenting technological challenges.

Purpose of the Study:

  • To realize and characterize titanium-based monolithic interferometers with independently tunable JJs.
  • To demonstrate precise control over the switching current amplitude and superconducting phase in JJs.

Main Methods:

  • Fabrication of titanium-based monolithic interferometers.
  • Independent voltage biasing of JJs via capacitively coupled electrodes.
  • Experimental characterization of switching current (Is) and superconducting phase tuning across a range of temperatures.

Main Results:

  • Demonstrated independent gate-tuning of two JJs in a monolithic interferometer.
  • Achieved full control over switching current amplitude and superconducting phase.
  • Observed significant suppression of total Is in a single JJ via gate-biasing, below the critical current of a single JJ.

Conclusions:

  • The developed titanium-based JJs offer unprecedented control for superconducting devices.
  • A theoretical model explains gate-induced phase fluctuations impacting JJ behavior.
  • These quantum interferometers hold promise for digital electronics, quantum computing, and sensitive detection applications.