arXiv subjects

Sobhan Sounda

Publications and source records attributed to Sobhan Sounda.

5 recordsLinked to original sources

arXiv2026

Decoherence of $q-$Deformed Photon Added Coherent State

In this study, we explore the behavior of photon added coherent states in a deformed harmonic oscillator subjected to dissipative decoherence. We use $q-$deformation as our nonlinear function to model our system. By adjusting the deformation parameter, we show that $q-$deformed photon added coherent state (DPACS) exhibit greater nonclassicality and resilience to decoherence compared to those of a standard harmonic oscillator. Additionally, we investigate the nonclassical properties and entanglement of DPACS under decoherence induced by interaction with a dissipative photon-loss environment.

quant-ph↗

arXiv2024

Nonclassicality and sub-Planck structures of photon subtracted compass states

We discuss the nonclassical properties of photon-subtracted compass states (PSCS). Nonclassical behavior is studied using various parameters like the Wigner function, squeezing, and photon statistical parameters like Mandels Q-function, second-order correlation function, Agarwal Tara $A_3$ criterion, and photon number distribution. Further analysis is being done to investigate the subPlanck structures in the Wigner functions of these PSCS. We also show that the photon subtraction does not cause the loss of sensitivity due to the displacement of the states in phase space.

quant-ph↗

arXiv2023

Derivation of Conservation Laws in 2nd order Quantum-Correlation Theory

This paper extends the foundational concept to second-order quantum correlation tensors, representing intensity-intensity correlations.As their application in diverse optical field experiments gaining importance, we investigate conserved quantities such as energy, linear and angular momentum and illuminate the dynamic nature of quantum correlations.

quant-ph↗

arXiv2018

Geometric Phase using Diagonal Coherent State Representation

Glauber-Sudarshan diagonal coherent state P-representation has been used to determine geometric phase for non-classical states of light. For a given density operator $\hat{ρ_1}$ of two mode optical beam, we evolve it in complex projective ray space $(\cal R)$ to $\hat{ρ_2}$ and to $\hat{ρ_3}$ by changing its state of polarisation using unitary operator $\mathrm{\hat{U}_p}(θ)$. The diagonal coherent state basis has been utilized to represent the density operators instead of fock state basis as in the fock state basis the state vector in present work evolve under unitary operator produe infinitely numerous terms which make the density operators very messy to handle. This cumbersome situation can be easily avoided by using the approach proposed above. The trace of the product of $\hat{ρ_1}$, $\hat{ρ_2}$ and $\hat{ρ_3}$ is taken to get three vertex Bargmann invariant. Argument of this gives the geometric phase which is represented in terms of phase space variables containing a notion of symplectic area.

quant-ph↗

arXiv2017

Single Particle Closed Orbit in Yukawa Potential

We study the orbit of a single particle moving under the Yukawa potential and observe the precessing ellipse type orbits. The amount of precession can be tuned through the coupling parameter $α$. With a suitable choice of the coupling parameter; we can get a closed bound orbit. In some cases we have observed some petals which can also have a closed bound nature with an appropriate choice of the coupling constant. A threshold energy has also been calculated for the boundness of the orbits.

physics.plasm-ph↗