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<p>In this paper, we investigate the quantum dynamics of a system comprising a non-degenerate <i>V</i>-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 <i>Q</i>-parameter is studied in detail. Our results demonstrate that intensity-dependent coupling, with the form <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(f(n)=\sqrt{n}\)</EquationSource> </InlineEquation>, significantly accelerates the loss of quantum coherence, resulting in a faster degradation of purity and fidelity compared to the constant coupling case (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(f(n)=1\)</EquationSource> </InlineEquation>). 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 <i>Q</i>-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.</p>

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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

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Lamia Thabet,
  • D. A. M. Abo-Kahla

摘要

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 \(f(n)=\sqrt{n}\) , significantly accelerates the loss of quantum coherence, resulting in a faster degradation of purity and fidelity compared to the constant coupling case ( \(f(n)=1\) ). 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.