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Quantum features of nonlinear coupler with competing nonlinearity.

Rafael Julius1,2, Abdel-Baset M A Ibrahim3, Pankaj Kumar Choudhury4

  • 1Faculty of Applied Sciences, Universiti Teknologi MARA (UiTM) Perak, Tapah Campus, 35400 Tapah Road, Perak, Malaysia.

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This study explores quantum features in a four-channel nonlinear waveguide coupler using competing nonlinearities. The system demonstrates enhanced squeezing and entanglement, offering a more efficient alternative for generating nonclassical effects.

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Area of Science:

  • Quantum optics
  • Nonlinear optics
  • Waveguide theory

Background:

  • Nonlinear optical couplers are crucial for manipulating light.
  • Competing nonlinearities (second- and third-order) offer unique quantum properties.
  • Previous models like the quantum optical dimer (QOD) and Kerr nonlinear coupler (KNC) have limitations.

Purpose of the Study:

  • To investigate the quantum features of a multi-waveguide nonlinear coupler.
  • To analyze the impact of competing second- and third-order nonlinearities on nonclassical states.
  • To demonstrate enhanced squeezing and entanglement generation.

Main Methods:

  • Utilizing the positive P representation of phase space.
  • Mapping the time-evolution of the density matrix to a Fokker-Planck equation.
  • Employing Langevin stochastic equations for phase space representation.

Main Results:

  • Demonstration of sub-Poissonian photon statistics.
  • Observation of enhanced squeezing in all channel waveguides.
  • Evidence of entanglement generation between waveguide modes.

Conclusions:

  • The proposed system with χ(2)-χ(3) interaction is a more efficient alternative to QOD and KNC.
  • The flexible coupled-mode interactions enhance nonclassical effects.
  • This structure provides a robust platform for generating advanced quantum states.