Title : Quantum squeezing in optical coupler via hyper raman interactions
Abstract:
A nonclassical state refers to a quantum state of light or matter that exhibits behaviours that cannot be explained by classical physics. In quantum optics, these states are characterized by phenomena such as squeezing, entanglement, or antibunching—properties that have no classical counterparts. In quantum mechanics, the electromagnetic field is described by two quadrature components, which correspond to observables represented by noncommuting operators in Hilbert space. Due to the non-commutative nature of these operators, it is impossible to simultaneously determine both quadrature components with perfect accuracy. However, the uncertainty distribution between the two quadratures can be modified, allowing a reduction in uncertainty for one component at the expense of the other. This reduction results in a nearly noiseless state, known as a "squeezed state." This study investigates the detection of quantum correlations, particularly quantum squeezing, in both single-mode and multimode configurations within an optical coupler. The optical system under consideration consists of a nonlinear waveguide that is coupled to a linear probe, providing a platform to explore these quantum effects. The system operates in a co-directional and asymmetric manner, with a nondegenerate pump mode interacting with the linear probe. We analyze the squeezing interactions between the pump mode and the Stokes, anti-Stokes, and phonon modes. Additionally, the study examines the squeezing correlations among the Stokes, anti-Stokes, and phonon modes. Recent advancements in quantum technologies and quantum information science have generated renewed interest in quantum squeezing. This is largely due to its crucial role in enhancing the precision of measurements and its potential for enabling a variety of quantum applications. As a result, squeezing has become a key focus in the development of next-generation quantum systems.
