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Chiral Interaction Induced Near-Perfect Photon Blockade.

Zhi-Guang Lu1, Ying Wu1, Xin-You Lü1

  • 1Huazhong University of Science and Technology, School of Physics and Institute for Quantum Science and Engineering, and Wuhan Institute of Quantum Technology, Wuhan 430074, China.

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|February 6, 2025
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Summary
This summary is machine-generated.

Chiral interactions enable near-perfect photon blockade in waveguide-cavity systems. This quantum electrodynamics approach offers robust, tunable single-photon sources with high transmission, ideal for integrated photonic circuits.

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Area of Science:

  • Quantum Optics
  • Quantum Electrodynamics
  • Condensed Matter Physics

Background:

  • Photon blockade (PB) is crucial for generating non-classical light states.
  • Existing methods often face limitations in efficiency and tunability.
  • Waveguide-cavity quantum electrodynamics (QED) systems offer a promising platform for controlling light-matter interactions.

Purpose of the Study:

  • To theoretically demonstrate the induction of almost perfect photon blockade (PB) using chiral interactions in a waveguide-cavity QED system.
  • To explore the mechanism of PB through multiphoton interference and analyze its dependence on system parameters.
  • To investigate the scalability and robustness of PB with multiple cavities and its potential for on-chip applications.

Main Methods:

  • Utilizing the scattering matrix method for theoretical analysis.
  • Deriving the analytic parameter regime for achieving g^{(2)}(0)≈0, indicating near-perfect PB.
  • Investigating the effect of introducing N cavities on PB properties and system robustness.

Main Results:

  • Chiral interactions can induce almost perfect photon blockade via multiphoton path interference.
  • The required chirality for PB decreases exponentially with the number of cavities (N), showing robustness against frequency disorder.
  • The output light state (coherent or single-photon) depends on the parity of N (N≥2) under resonant driving.

Conclusions:

  • This work presents a novel route to achieve near-perfect PB with high single-photon transmission using chirality.
  • The proposed system offers tunable control over photon statistics, paving the way for advanced quantum optical devices.
  • The findings have significant implications for developing integrated on-chip single-photon sources with enhanced functionality.