Quantum entanglement and position-momentum entropic squeezing of a moving Lambda-type three-level atom interacting with a single-mode quantized field with intensity-dependent coupling

TL;DR

This study explores how intensity-dependent coupling and atomic motion influence nonclassical phenomena like entanglement and squeezing in a three-level atom interacting with a quantized field, revealing controllable quantum features.

Contribution

It provides an explicit state vector for a moving Lambda-type atom-field system with intensity-dependent coupling, analyzing its nonclassical properties and control mechanisms.

Findings

Squeezing periods and degrees can be controlled via nonlinearity and atomic motion.

Atomic motion induces oscillatory entanglement behavior.

Maximal squeezing and entropy squeezing duration are adjustable.

Abstract

In this paper, we study the interaction between a moving $\Lambda$-type three-level atom and a single-mode cavity field in the presence of intensity-dependent atom-field coupling. After obtaining the state vector of the entire system explicitly, we study the nonclassical features of the system such as quantum entanglement, position-momentum entropic squeezing, quadrature squeezing and sub-Poissonian statistics. According to the obtained numerical results we illustrate that the squeezed period, the duration of entropy squeezing and the maximal squeezing can be controlled by choosing the appropriate nonlinearity function together with entering the atomic motion effect by suitably selection of the field-mode structure parameter. Also, the atomic motion, as well as the nonlinearity function leads to the oscillatory behaviour of the degree of entanglement between the atom and field.