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Laser Physics

Squeezing across two harmonic generations utilizing coupled nonlinear waveguide systems

Mohammad Zulkarnain Khan Bin Zulkifpeli, Rafael Julius, Abdel-Baset M.A. Ibrahim

Published Feb 20, 2025• 0 citations
Publisher

Abstract

Abstract This study investigates the squeezing properties of light across a two-octave system consisting of multichannel single-mode nonlinear waveguides with evanescent coupling. The focus is on the first, second, and fourth harmonics generation. We analyze different input combinations and coupling setups to gain insight into how they impact the level of squeezing. The results show that multiple initial inputs amplify the squeezing effect, while certain initialization setups help maintain squeezing at higher harmonic levels. When the waveguides are fully coupled in the first octave, there is a large increase in squeezing at the first and second harmonic. Reduced coupling leads to a drop in the level of squeezing. At the fourth harmonic frequency, instability is observed in all configurations, which hinders the accurate detection of squeezing. By optimizing the quantity and arrangement of interconnected waveguides, it is possible to improve the nonlinear frequency conversion and thus the level of squeezing. This research may enhance the advancement of quantum optical systems by emphasizing the significance of coupling interactions across two harmonic generations.

DOI
10.1088/1555-6611/adb4c9

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Abstract This study investigates the squeezing properties of light across a two-octave system consisting of multichannel single-mode nonlinear waveguides with evanescent coupling. The focus is on the first, second, and fourth harmonics generation. We analyze different input combinations and coupling setups to gain insight into how they impact the level of squeezing. The results show that multiple initial inputs amplify the squeezing effect, while certain initialization setups help maintain squeezing at higher harmonic levels. When the waveguides are fully coupled in the first octave, there is a large increase in squeezing at the first and second harmonic. Reduced coupling leads to a drop in the level of squeezing. At the fourth harmonic frequency, instability is observed in all configurations, which hinders the accurate detection of squeezing. By optimizing the quantity and arrangement of interconnected waveguides, it is possible to improve the nonlinear frequency conversion and thus the level of squeezing. This research may enhance the advancement of quantum optical systems by emphasizing the significance of coupling interactions across two harmonic generations.
This study investigates the impact of second harmonic coupling on the performance and efficiency of a dual-octave nonlinear waveguide system. Comparative analysis of simulation data with and without second harmonic coupling shows significant enhancement in squeezing values and stability across all harmonics. Notably, the presence of second harmonic coupling enhances first harmonic squeezing from10−5\mathbf{10}^{-\mathbf{5}}10−5to10−3\mathbf{10}^{-\mathbf{3}}10−3, second harmonic squeezing from10−9\mathbf{10}^{-\mathbf{9}}10−9to10−3\mathbf{10}^{-\mathbf{3}}10−3, and stabilizes fourth harmonic squeezing at10−7\mathbf{10}^{-\mathbf{7}}10−7. Furthermore, the second harmonic coupling improves frequency conversion efficiency and ensures uniform squeezing distribution across waveguides. The findings show the critical role of second harmonic coupling in optimizing nonlinear waveguide systems for enhanced stability, efficiency, and squeezing performance.
This paper investigates the squeezing properties and harmonic generation in a two-octave nonlinear waveguide system composed of channels exhibiting a second-order nonlinear effect. The channel converts an input frequency at the first harmonic to the second and subsequently to the fourth harmonic. The system equation is solved semi-analytically by using the normal ordered phase space representation. The results show consistent first harmonic squeezing across channels, while second and fourth harmonic squeezing vary significantly, with the center channels showing higher efficiency. As the harmonic generation progresses from the first harmonic to the fourth harmonic, the magnitude of squeezing typically decreases. These findings may provide valuable findings for enhancing higher-order harmonic generation and squeezing in nonlinear waveguide systems.
We report an examination on the possibility of generating enhanced squeezed light over two octaves of frequency difference, with each octave incorporating two-channel nonlinear waveguides suited for the fundamental, second, and fourth harmonic modes. We investigate the behavior of squeezing owing to the presence of evanescent coupling in scenarios for traveling-wave and intracavity cases. We show that the existing technique may generate enhanced squeezing in a frequency range spanning the fourth harmonic.
The generation of squeezed light across dual octaves with single-mode multichannel nonlinear waveguides exhibits dynamic behavior. In this study, we examine the impact of coherent state initialization, channel interaction, nonlinearity strength, and inter-channel interaction on the generation of squeezed light over several channels. The findings demonstrate that the process of coherent state initialization and the addition of channel interaction significantly enhance the amount of squeezing, hence emphasizing their critical role in the optimization of squeezed light generation. Additionally, an occurrence of squeezing that is not dependent on nonlinearity is observed within a limited range of parameters. This presents opportunities for generating squeezed light in dual-octave systems with many channels.
The properties of squeezing, in relation to the different interaction frequencies of the input modes in three-mode Kerr nonlinear coupler consisting of two linearly-coupled Kerr waveguides, were explored. Utilizing the exact representation of a set of noisy-stochastic equations, an investigation was made of the first-order properties of squeezing for two- and three-mode interactions with frequency mismatch. It was observed that enhanced squeezing could be obtained under certain conditions of interactions.