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Nonreciprocal Josephson Linear Response.

Pauli Virtanen1, Tero T Heikkilä1

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This study reveals that multiterminal Josephson junctions exhibit linear nonreciprocity at finite frequencies, unlike static Josephson diodes. This finding enables the development of efficient, small-scale on-chip circulators using microwave transmission.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Electronics
  • Mesoscopic Physics

Background:

  • Josephson junctions are key components in superconducting electronics.
  • Static Josephson diodes exhibit nonlinear nonreciprocity.
  • Understanding finite-frequency response is crucial for advanced applications.

Purpose of the Study:

  • To investigate the finite-frequency response of multiterminal Josephson junctions.
  • To explore the emergence of linear nonreciprocity in these systems.
  • To identify potential applications of this nonreciprocal behavior.

Main Methods:

  • Analysis of the finite-frequency response of multiterminal Josephson junctions.
  • Incorporation of dynamic contributions to Josephson admittance.
  • Consideration of Andreev bound state transitions and Berry phase effects.

Main Results:

  • Nonreciprocity observed at linear response for finite-frequency Josephson junctions.
  • Dynamic contributions to Josephson admittance include Andreev bound state and Berry phase effects.
  • Nonreciprocal reactive response observed outside exact Andreev resonances.
  • Nondissipative microwave transmission and near-complete electromagnetic scattering nonreciprocity.

Conclusions:

  • Finite-frequency Josephson junctions exhibit linear nonreciprocity, distinct from static diodes.
  • This nonreciprocity can be leveraged to create efficient, small-scale, on-chip circulators.
  • The developed systems require only modest magnetic fields for operation.