Sub-Poissonian photon squeezing and entanglement in optical chain second harmonic generation

Julius, Rafael; Ibrahim, Abdel Baset Mohamed El Nabwi Abdel Hamid; Eleuch, Hichem; Choudhury, Pankaj Kumar

doi:10.1080/09500340.2019.1603408

Cited by 12 publications

(2 citation statements)

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“…Waveguiding structure has gained considerable attention in the development of nonlinear phenomena related to the generation of quantum effects 26 – 28 . We reported before the possibilities of generating enhanced nonclassical states via multichannel interactions exploiting nonlinear waveguides with the second- χ (2) 22 , 23 or third-order χ (3) 24 , 25 nonlinear effects. The basic concept behind this was to enhance the number of interacting modes by increasing the number of χ (2) or χ (3) waveguides, wherein each system was treated independently.…”

Section: Introductionmentioning

confidence: 99%

Quantum features of nonlinear coupler with competing nonlinearity

Julius

Ibrahim

Choudhury

et al. 2022

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In this work, we examine the quantum features of a multi-waveguide nonlinear coupler exploiting the second-and third-order nonlinearities. The considered system contains four identical channels, each with a single fundamental transverse mode. The essence of this type of nonlinear coupler is to examine the effect of two or more competing nonlinearities on the generated nonclassical features in this class of devices. Here, we consider the case of second harmonic generation, wherein the fundamental harmonic (FH) fields are up-converted in pairs to double-frequency second harmonic (SH) fields, which are then evanescently coupled with the fields from other Kerr nonlinear waveguides. Using the positive P representation of the phase space, the time-evolution of the density matrix could be mapped to the corresponding Fokker–Planck equation of a classical quasiprobability distribution. Using Langevin stochastic equation, an exact representation of the system in phase space led to the demonstration of sub-Poissonian property, squeezing, and entanglement. With more effective squeezing achieved in all channel waveguides, the present system with χ(2)–χ(3) interaction can be a more efficient alternative to other versions of nonlinear couplers such as the quantum optical dimer (QOD) and Kerr nonlinear coupler (KNC). Furthermore, such a structure offers more flexibility in coupled-mode interactions in the form of correlation between the modes in different waveguides. This provides a better mechanism for the generation of enhanced nonclassical effects.

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Section: Introductionmentioning

confidence: 99%

Quantum features of nonlinear coupler with competing nonlinearity

Julius

Ibrahim

Choudhury

et al. 2022

Sci Rep

Self Cite

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show abstract

“…Introduction Squeezed light has a variety of potential applications because it permits measurements with less quantum noise, such as in applications for photonic quantum computing [1,2] and communication [3]. Different configurations can be used to generate squeezing, and one of the most reliable candidates that have attracted a lot of attention in the literature is the nonlinear process known as second harmonic generation [4,5]. Squeezing occurred at both the fundamental and second harmonic frequencies of the field modes, which was the primary feature of the process throughout an octave.…”

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confidence: 99%