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Quantum Squeezing Induced Optical Nonreciprocity.

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  • 1College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.

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We demonstrate an all-optical chip device for optical nonreciprocity using quantum squeezing. This enables on-chip optical diodes, quasicirculators, and transistors for quantum information processing.

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Area of Science:

  • Quantum optics
  • Integrated photonics
  • Nonlinear optics

Background:

  • Optical nonreciprocity is crucial for integrated photonic circuits.
  • Existing methods often require complex structures or external magnetic fields.
  • On-chip solutions are highly desirable for miniaturization and scalability.

Purpose of the Study:

  • To propose and demonstrate an all-optical method for achieving chip-based optical nonreciprocity.
  • To develop novel nonreciprocal devices like optical diodes and quasicirculators.
  • To enable applications in quantum information processing and optical signal routing.

Main Methods:

  • Utilizing quantum squeezing of coupled resonator modes via parametric pumping.
  • Inducing chiral photon interaction through nonlinear optical effects.
  • Employing squeezed-vacuum fields for single-photon operation.

Main Results:

  • Achieved an all-optical diode with >40 dB isolation.
  • Demonstrated a three-port quasicirculator with >98% fidelity.
  • Obtained insertion loss <1 dB for both devices.
  • Showcased transistor-like switching of light using weak pump control.

Conclusions:

  • The proposed all-optical approach enables high-performance, chip-compatible nonreciprocal devices.
  • This work provides a new pathway for integrated optical isolation and quantum information processing.
  • The demonstrated devices offer potential for advanced photonic functionalities and optical signal control.