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Friederike U J Klauck1, Matthias Heinrich1, Alexander Szameit1

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This summary is machine-generated.

We explored two-photon quantum states in non-Hermitian systems near exceptional points. Quantum interference and correlations change distinctly, revealing a link between quantum phenomena and exceptional points.

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Area of Science:

  • Quantum physics
  • Non-Hermitian photonics
  • Quantum information science

Background:

  • Exceptional points (EPs) are crucial in non-Hermitian systems, but their quantum behavior is under-explored.
  • Previous studies primarily focused on classical dynamics in photonic EPs.

Purpose of the Study:

  • Investigate the dynamics of two-photon quantum states across exceptional points in a non-Hermitian system.
  • Explore the interplay between quantum interference and exceptional points in photonics.

Main Methods:

  • Probed a lossy directional coupler with an indistinguishable two-photon input state.
  • Analyzed changes in quantum correlations and interference at the output.
  • Observed spontaneous breaking of parity-time symmetry.

Main Results:

  • Distinct changes in quantum correlations were observed as the system crossed the exceptional point.
  • Demonstrated switching in quantum interference, transforming Hong-Ou-Mandel dips into peaks.
  • Showcased the direct link between quantum interference and exceptional points.

Conclusions:

  • Quantum states exhibit unique behavior near exceptional points in non-Hermitian photonics.
  • Exceptional points offer novel ways to control and manipulate quantum interference.
  • This work opens new avenues for exploring quantum phenomena in non-Hermitian systems.