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Deterministic Photon Sorting in Waveguide QED Systems.

Fan Yang1, Mads M Lund1, Thomas Pohl1

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Researchers demonstrate a method to sort quantum fields using chirally coupled emitters. This technique achieves high fidelity in scattering single- and two-photon pulses into distinct temporal modes, enabling quantum information processing.

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Area of Science:

  • Quantum optics
  • Quantum information processing
  • Solid-state quantum emitters

Background:

  • Sorting quantum fields into distinct modes based on Fock-space quantum numbers is crucial for quantum operations.
  • Efficient manipulation of single and two-photon states is essential for building quantum technologies.
  • Chiral coupling of emitters to waveguides offers unique light-matter interaction pathways.

Purpose of the Study:

  • To demonstrate a high-fidelity quantum operation for sorting quantum field modes.
  • To investigate the scattering dynamics of single and two-photon components using chirally coupled emitters.
  • To develop a theoretical framework for characterizing and optimizing this quantum sorting process.

Main Methods:

  • Utilized a pair of two-level emitters chirally coupled to a waveguide.
  • Analyzed the scattering of single- and two-photon components of an input pulse.
  • Developed a general theory to model and optimize the scattering dynamics and fidelity.

Main Results:

  • Achieved high-fidelity scattering (≳0.9997) of single- and two-photon components into orthogonal temporal modes.
  • Revealed a two-photon scattering dynamics involving complex multimode field generation and recombination.
  • Demonstrated that the net two-photon scattering induces a self-time reversal of the input pulse mode.

Conclusions:

  • The proposed scheme effectively sorts quantum fields into different temporal modes with exceptional fidelity.
  • The observed self-time reversal dynamics in two-photon scattering is key to the high-fidelity sorting.
  • This method provides a pathway for constructing essential quantum logic elements, including a deterministic nonlinear-sign gate (fidelity ≳0.9995).