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We developed a passive quantum phase gate for photons using chirally coupled emitters. This method achieves high fidelity and success probability, crucial for quantum information processing.

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Area of Science:

  • Quantum optics
  • Solid-state quantum information

Background:

  • Implementing quantum gates is essential for quantum computing.
  • Photonic quantum gates often require complex control mechanisms.

Purpose of the Study:

  • To present a fully passive method for a two-photon quantum phase gate.
  • To utilize chirally coupled emitters in a V-configuration for photonic interaction.

Main Methods:

  • Employing a one-dimensional waveguide with chirally coupled emitters.
  • Analyzing the nonlinear scattering of polariton states.
  • Investigating the gate performance with varying numbers of emitters.

Main Results:

  • A perfect control phase gate is achieved for near-resonant photons with many emitters.
  • A frequency filter suppresses dominant errors for finite emitters.
  • Fidelity reaches ~99% with >99% success probability using eight emitters.

Conclusions:

  • The proposed passive method is efficient for photonic quantum phase gates.
  • Error suppression techniques enhance gate performance.
  • This approach offers a promising route for scalable quantum information processing.