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arXiv:2406.17407 · EPJ Quantum Technology

Nonclassical light in a three-waveguide coupler with second-order nonlinearity

Mohd Syafiq M. Hanapi, Abdel-Baset M.A. Ibrahim, Rafael Julius, P. K. Choudhury, Hichem Eleuch

Published Aug 14, 2024• 5 citations
arXivHTMLPDF

Abstract

Possible squeezed states generated in a three-waveguide nonlinear coupler operating with second harmonic generation is discussed. This study is carried out using two well-known techniques; the phase space method (based on positive-P representation) and the Heisenberg-based analytical perturbative (AP) method. The effects of key design parameters were investigated under various conditions, including full frequency matching, symmetrical and asymmetrical waveguide initialization, and both codirectional and contr-adirectional propagation. The system consistently produced long-lasting oscillatory squeezed states across all three waveguides, even when only one waveguide was pumped with coherent light while the others were in a vacuum state. Also, the performance and capacities of both methods are critically evaluated. For low levels of key design parameters and in the early stages of evolution, a high level of agreement between the two methods is noticed. In the new era of quantum-based technology, the proposed system opens a new avenue for utilising nonlinear couplers in nonclassical light generation.

DOI
10.1140/epjqt/s40507-024-00263-9

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