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Enhancing Nonreciprocity through Squeezing-Induced Symmetry Breaking.

B-B Liu1, D-Y Wang1, J Tang2

  • 1Zhengzhou University, Quantum Information Institute, School of Physics and Laboratory of Zhongyuan Light, Zhengzhou 450001, China.

Physical Review Letters
|July 10, 2026
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Summary
This summary is machine-generated.

This study introduces a novel method using reservoir squeezing to significantly enhance nonreciprocity in quantum systems. This breakthrough dramatically improves quantum battery performance and optical isolation for advanced quantum device design.

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Area of Science:

  • Quantum physics
  • Quantum optics
  • Quantum information science

Background:

  • Reservoir engineering is crucial for controlling energy and signal flow.
  • Nonreciprocity is essential for unidirectional signal transmission in quantum devices.
  • Existing methods for achieving nonreciprocity often require high squeezing strengths.

Purpose of the Study:

  • To establish squeezing-induced symmetry breaking as a principle for amplifying reservoir-mediated nonreciprocity.
  • To develop a mechanism that relaxes experimental requirements for achieving nonreciprocity.
  • To enhance the performance of quantum batteries and optical isolation.

Main Methods:

  • Utilizing squeezing-induced symmetry breaking between two cavities.
  • Strategically redistributing squeezing resources.
  • Analyzing noise correlations and system dynamics under reservoir squeezing.

Main Results:

  • Achieved exponential amplification of reservoir-mediated nonreciprocity.
  • Demonstrated significant improvements in quantum battery performance (energy, power, ergotropy) by several orders of magnitude.
  • Observed a second-order exponential enhancement in optical isolation.

Conclusions:

  • Squeezing-induced symmetry breaking offers a powerful route to enhanced nonreciprocity.
  • Reservoir squeezing reshapes noise correlations, altering system dynamics without breaking symmetry.
  • The proposed mechanism provides a new pathway for designing high-performance nonreciprocal quantum information processing devices.