By making use of two external pumps here it is shown that a given medium, with high-order optical susceptibility tensor, is a good candidate to get enhanced squeezing, by considerably reducing the interaction length.
The effect of enhancing nonlinear generation of entangled photons in the process of interaction of the external coherent electromagnetic field with a nonlinear dispersive medium is studied in this paper. Taking into account the second- and third-order susceptibility tensors of the crystal, it is demonstrated that in the good cavity approximation the bistable behaviour of the two-photon generation coefficient as a function of intensity of the pump laser field is possible. This effect is stimulated by decreasing the detuning between the frequency of the cavity mode and pump frequency as a function of anharmonicity terms in polarization.
The effect of enhancing nonlinear generation of entangled photons in the process of interaction of the external coherent electromagnetic field with nonlinear dispersive medium is studied in this paper. Taking into account the second and third order of the susceptibility tensor of the crystal, it is demonstrated that in good cavity approximation the bistable behavior of the two photon generation coefficient as a function of intensity of the pump laser field is possible. This effect is stimulated by decreasing the detuning between the frequency of the cavity mode and pump frequency as a function of an harmonicity terms in polarization.
Squeezed states of light represent one of the most fundamental concepts in quantum optics. They play a crucial role in various fields of science, quantum technology, and photonics, with applications in quantum information processing, quantum computation, quantum sensing, and gravitational wave detection. In this paper, we propose a plasmonic waveguide for the generation of squeezed states via four-wave mixing. The designed waveguide consists of two gold layers deposited on a SiO 2 substrate. DDMEBT, an organic material with a high third-order nonlinear refractive index, is placed on the gold layers and fills the gap between them. To determine the effective refractive indices and corresponding mode wavelengths, the waveguide was simulated using the Mode Analysis module of COMSOL Multiphysics. The coupled equations describing degenerate four-wave mixing for the pump, signal, and idler fields were derived. Furthermore, we present the quantum mechanical formulation of four-wave mixing in terms of expectation values and fluctuations, introducing both single-mode and two-mode squeezing factors. The influence of pump power on the squeezing factor is analyzed, revealing that higher pump powers enhance the squeezing level and reduce the required propagation length to reach maximum squeezing. Compared with previous studies based on second-harmonic generation, the required waveguide length to achieve maximum squeezing in our proposed structure is reduced by three order of magnitude. The detrimental effects of optical losses on the squeezing process are also investigated. Finally, the impact of the interlayer gap width on the squeezing factor is examined, demonstrating that increasing the gap between the gold layers leads to a degradation in the squeezing quality.