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The European Physical Journal Plus

Intrinsic decoherence effect on quantum coherence dynamics of a qutrit interacting resonantly with a coherent cavity field

A.‐B. A. Mohamed, H. A. Hessian

Published Apr 1, 2021• 4 citations
Publisher
DOI
10.1140/epjp/s13360-021-01369-0

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In this article, we introduce an analytical description for the nonlinear off-resonance qutrit-cavity system through intensity-dependent nonlinear coupling under intrinsic decoherence. When the cavity is initially in coherent and even coherent states. The dynamics of the negativity entanglement, in the off-resonance qutrit-cavity system, is investigated under the physical parameters of the qutrit-cavity detuning, the intrinsic decoherence as well as the initial cavity coherent states. It is found that the ability of the off-resonance qutrit-cavity interaction to generate the entanglement, depends on the physical parameters. The high nonclassicality of the even coherent state can enhance the generated entanglement and its stability. For the intrinsic decoherence, the amount and the stability of the generated qutrit-cavity entanglement can be controlled by the coherent field intensity of the initial cavity states.
In this paper, an intrinsic decoherence model is solved analytically for a Λ-type qutrit interacting with a coherent field through intensity-dependent coupling. The effects of the qutrit-cavity interaction, the intrinsic decoherence and the initial coherent field intensity are examined on some quantum phenomena as: atom population inversion, mixedness, entanglement as well as total correlation. It is found that the increase of the physical parameters, the regular oscillatory behavior of the qutrit-population collapses and revivals are changed remarkably. The interaction between the three-level atom and the coherent cavity field generates a strong mixture, negativity entanglement and total correlation (classical + quantum). The growth, the regularity and the stability of these quantum effects depend on the decoherence and the initial coherent cavity intensity.
Abstract This paper presents a comprehensive investigation into the complex dynamics of optical tomography and quantum coherence within a nonlinear interaction system. The system under study is composed of an Ξ-type qutrit and a deformed cavity-field, analyzed for two distinct initial states: coherent states and even coherent states. Our analysis thoroughly considers the influence of intrinsic decoherence, a critical factor in understanding quantum system evolution. This study explores the remarkable sensitivity of optical tomography distributions (OTDs) to key parameters, including the initial state, evolution time, and the effects of a Kerr-like nonlinearity. We demonstrate that while coherent states initially appear classical, they display early-stage quantum interference due to their intrinsic parity symmetry, evolving into intricate patterns over time. This evolution is particularly susceptible to intrinsic decoherence, which significantly dampens these quantum features. Our findings show that the OTD is a powerful tool for tracking coherence loss and for accurately capturing the combined effects of nonlinearity and state symmetry on a system’s quantum state.