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Nonreciprocity and Circulation in a Passive Josephson-Junction Ring.

Arkady Fedorov1, N Pradeep Kumar1, Dat Thanh Le1

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Researchers developed a miniaturized microwave circulator using Josephson junctions. This compact device enables nonreciprocal scattering for quantum circuits, achieving 14 dB isolation and 200 MHz bandwidth.

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Area of Science:

  • Quantum Computing
  • Solid State Physics
  • Microwave Engineering

Background:

  • Superconducting quantum circuits require miniaturized supporting devices like microwave circulators.
  • Current circulators are bulky and limit large-scale integration.

Purpose of the Study:

  • To demonstrate a compact, integrated circulator for superconducting quantum circuits.
  • To investigate nonreciprocal microwave scattering using Josephson junctions.

Main Methods:

  • Fabricated and measured microwave scattering from a ring of Josephson junctions.
  • Utilized dc-only control fields for device operation.
  • Analyzed quasiparticle tunneling and classified system behavior into sectors.

Main Results:

  • Observed unambiguous nonreciprocal 3-port scattering within a specific quasiparticle sector.
  • Achieved optimal circulator performance with 2 dB insertion loss, 14 dB isolation, -11 dB reflectance, and 200 MHz bandwidth.
  • Demonstrated dynamic classification of the system into quasiparticle sectors.

Conclusions:

  • A Josephson junction-based circulator can be integrated into superconducting quantum circuits.
  • The device offers a path towards miniaturization and improved performance of quantum computing hardware.
  • Quasiparticle dynamics play a crucial role in circulator operation and optimization.