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Passive Superconducting Circulator on a Chip.

Rohit Navarathna1, Dat Thanh Le1, Andrés Rosario Hamann1

  • 1ARC Centre for Engineered Quantum System, School of Mathematics and Physics, University of Queensland, Brisbane QLD 4072, Australia.

Physical Review Letters
|February 10, 2023
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Summary
This summary is machine-generated.

We developed a passive on-chip circulator using Josephson junctions, compatible with superconducting circuits. This innovation avoids external driving or magnetic fields, paving the way for scalable quantum technologies.

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Area of Science:

  • Quantum Engineering
  • Superconducting Circuits
  • Microwave Engineering

Background:

  • On-chip microwave circulators are crucial for scaling superconducting circuits.
  • Existing circulators require external driving or magnetic fields, hindering superconductivity.

Purpose of the Study:

  • To demonstrate a passive, on-chip circulator compatible with superconducting devices.
  • To overcome limitations of previous circulator integration methods.

Main Methods:

  • Fabrication of a superconducting loop with three Josephson junctions.
  • Tuning the device using only DC control fields.
  • Analysis of quasiparticle tunneling via a hidden Markov model.

Main Results:

  • Experimental evidence of nonreciprocal scattering.
  • Excellent agreement between experimental data and theoretical simulations.
  • Detailed analysis of quasiparticle tunneling dynamics.

Conclusions:

  • The Josephson-junction-based circulator offers a viable, on-chip solution.
  • Future improvements can enhance performance and integration.
  • This technology is anticipated to become ubiquitous in superconducting circuits.