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Quantum dynamics and entanglement in a damped V-type five-level atom interacting with a two-mode cavity field under intensity-dependent coupling.

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Bibliographic Details
Title: Quantum dynamics and entanglement in a damped V-type five-level atom interacting with a two-mode cavity field under intensity-dependent coupling.
Authors: Thabet, Lamia1 (AUTHOR), Abo-Kahla, D. A. M.1,2 (AUTHOR) doaa_abukahla@ymail.com
Source: Optical & Quantum Electronics. May2026, Vol. 58 Issue 5, p1-17. 17p.
Subjects: Coupling schemes, Quantum coherence, Quantum states, Optical resonance, Quantum entanglement, Quantum theory
Abstract: In this paper, we investigate the quantum dynamics of a system comprising a non-degenerate V-type five-level atom interacting with a two-mode cavity field under an intensity-dependent coupling regime. We analyze the effects of atomic and cavity decay rates, detunings, the presence of a Kerr-like medium, and the form of the coupling function (constant versus intensity-dependent) on the quantum properties of the system. The temporal evolution of purity, fidelity, and the Mandel Q-parameter is studied in detail. Our results demonstrate that intensity-dependent coupling, with the form , significantly accelerates the loss of quantum coherence, resulting in a faster degradation of purity and fidelity compared to the constant coupling case (). Nevertheless, the intensity-dependent coupling proves more effective in generating non-classical states of the radiation field, as evidenced by pronounced sub-Poissonian photon statistics reflected in strongly negative values of the Mandel Q-parameter. This work highlights a fundamental trade-off between the stability of quantum states and the ability to produce non-classical light in cavity quantum electrodynamics (QED) systems. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:In this paper, we investigate the quantum dynamics of a system comprising a non-degenerate V-type five-level atom interacting with a two-mode cavity field under an intensity-dependent coupling regime. We analyze the effects of atomic and cavity decay rates, detunings, the presence of a Kerr-like medium, and the form of the coupling function (constant versus intensity-dependent) on the quantum properties of the system. The temporal evolution of purity, fidelity, and the Mandel Q-parameter is studied in detail. Our results demonstrate that intensity-dependent coupling, with the form , significantly accelerates the loss of quantum coherence, resulting in a faster degradation of purity and fidelity compared to the constant coupling case (). Nevertheless, the intensity-dependent coupling proves more effective in generating non-classical states of the radiation field, as evidenced by pronounced sub-Poissonian photon statistics reflected in strongly negative values of the Mandel Q-parameter. This work highlights a fundamental trade-off between the stability of quantum states and the ability to produce non-classical light in cavity quantum electrodynamics (QED) systems. [ABSTRACT FROM AUTHOR]
ISSN:03068919
DOI:10.1007/s11082-026-08789-1