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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

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Published on: September 5, 2019

Single-photon diode by exploiting the photon polarization in a waveguide.

Yuecheng Shen1, Matthew Bradford, Jung-Tsung Shen

  • 1Department of Electrical and Systems Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, USA.

Physical Review Letters
|November 24, 2011
PubMed
Summary

Researchers developed a single-photon optical diode using quantum impurities in waveguides. This device enables unidirectional light flow for individual photons, crucial for quantum technologies.

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Area of Science:

  • Quantum optics
  • Solid-state physics
  • Nanophotonics

Background:

  • Single-photon devices are essential for quantum information processing.
  • Achieving efficient and robust optical diodes at the quantum level remains a challenge.
  • Existing methods often require active components or specific conditions.

Purpose of the Study:

  • To demonstrate a practical single-photon optical diode.
  • To utilize quantum impurity coupling in a passive waveguide for unidirectional photon propagation.
  • To analyze the performance and robustness of such a device.

Main Methods:

  • Coupling a quantum impurity to a passive, linear optical waveguide.
  • Exploiting a waveguide with locally planar, circular polarization.
  • Analyzing photon propagation and contrast using theoretical models.
  • Investigating the effect of finite frequency bandwidth and impurity dissipation.

Main Results:

  • A single-photon optical diode was successfully demonstrated.
  • Near-unitary contrast was achieved for broadband single-photon pulses.
  • The device performance is independent of the quantum impurity's intrinsic dissipation.
  • The concept is applicable to various waveguide types.

Conclusions:

  • A robust and efficient single-photon optical diode can be realized by coupling quantum impurities to specifically designed waveguides.
  • This approach offers a promising pathway for building essential components for quantum communication and computation.
  • The insensitivity to dissipation simplifies practical implementation and enhances device reliability.