Nonclassical effects in a highly nonlinear generalized homogeneous Dicke model

Nonclassical effects in the second harmonic generation

“…The initially coherent cavity field can be squeezed when it interacts either with a single atom or with a group of N two-level atoms, which is placed in a volume with dimensions small compared to the wavelength associated with the atom's two-level dipole and evolves on time scales shorter than any J 2 -breaking relaxation mechanism, an example of which is an angular momentum system, which has collective atomic raising and lowering operators, J + and J − , with a fixed spin quantum number J = N/2 [8].…”

“…In this context it is worth noting that several new applications of these nonclassical states have been reported in recent past [3][4][5][6][7]. As a consequence of these recently reported applications, generation of nonclassical states in various quantum systems emerged as one of the most important areas of interest in quantum information theory and quantum optics [8,9]. Several systems are already investigated and have been shown to produce entanglement and other nonclassical states [10,11].…”

Variance squeezing and information entropy squeezing via Bloch coherent states in two-level nonlinear spin models

“…Because of its distinct advantages the extensions of the basic JCM have been extremely plentiful, e.g., the generalized N-level JCM [14,15], JCM beyond RWA [16][17][18][19], non-linear JCM [8,9,20,21], and JCM with intensity-dependent coupling [19,[22][23][24].…”