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Breaking Lorentz Reciprocity with Frequency Conversion and Delay.

Eric I Rosenthal1, Benjamin J Chapman1, Andrew P Higginbotham1

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Researchers developed a novel method to break Lorentz reciprocity using frequency conversion and delay, enabling scalable, broadband nonreciprocal circuits without magnetic materials. This breakthrough paves the way for advanced telecommunication and quantum computing applications.

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Area of Science:

  • Physics
  • Electrical Engineering
  • Materials Science

Background:

  • Lorentz reciprocity is a fundamental principle in wave propagation, limiting the development of nonreciprocal devices.
  • Existing nonreciprocal devices often rely on magnetic materials or resonant structures, which can be bulky, lossy, and difficult to scale.

Purpose of the Study:

  • To introduce a new method for breaking Lorentz reciprocity.
  • To design scalable and broadband nonreciprocal circuits.
  • To demonstrate the construction of gyrators and a circulator using this method.

Main Methods:

  • Utilizing the noncommutation of frequency conversion and delay to break Lorentz reciprocity.
  • Designing and constructing two types of gyrators, which are universal building blocks for linear, nonreciprocal circuits.
  • Implementing a circulator using one of the designed gyrators.

Main Results:

  • Achieved >15 dB isolation across the 5-9 GHz band for the constructed circulator.
  • Demonstrated a method that does not require magnetic materials or resonant physics.
  • Developed scalable and broadband nonreciprocal circuit designs.

Conclusions:

  • The proposed method effectively breaks Lorentz reciprocity, enabling the creation of advanced nonreciprocal devices.
  • The designs are versatile and can be extended to various platforms, including semiconducting devices and superconducting circuits.
  • This work has significant implications for telecommunications and quantum information processing.