<p>We theoretically investigate laser-controlled quantum correlations in WX<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(_2\)</EquationSource> </InlineEquation> (X = S, Se) monolayer dichalcogenides, modeled as effective two-qubit systems governed by a low-energy Hamiltonian including intrinsic spin-orbit coupling and light-matter interaction. Dissipative effects are incorporated through the Milburn intrinsic decoherence formalism to account for decoherence mechanisms inherent to realistic solid-state environments. We analyze the behavior of concurrence, total coherence, local coherence, and correlated coherence under variations of laser field strength, frequency, and polarization. In the absence of irradiation, quantum correlations rapidly diminish and remain negligible. Laser driving activates and stabilizes quantum resources, leading to non-trivial dynamical regimes. Entanglement exhibits a non-monotonic dependence on field strength, with an optimal intermediate regime maximizing concurrence before strong-field-induced decoherence suppresses correlations. We demonstrate that laser frequency critically determines the stability window of entanglement: higher-frequency sources (Nd:YAG and He-Ne) promote broader and more robust correlation regions through enhanced photon-assisted interband transitions, whereas low-frequency excitation (CO<InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(_2\)</EquationSource> </InlineEquation>) yields narrower stability intervals. Polarization further acts as a selective control parameter, with linear polarization maximizing both concurrence and correlated coherence, highlighting the importance of directional field-matter coupling. A comparative analysis shows that WSe<InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(_2\)</EquationSource> </InlineEquation> displays enhanced robustness relative to WS<InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(_2\)</EquationSource> </InlineEquation>, which is attributed to the combined influence of its stronger spin-orbit interaction, smaller band gap, and modified low-energy band structure. Our results establish laser intensity, frequency, and polarization as complementary external control parameters for engineering and stabilizing quantum resources in transition metal dichalcogenide monolayers, paving the way for optically tunable solid-state platforms for quantum information and spintronic technologies.</p>

Laser-induced effects on quantum entanglement and coherence dynamics in WX\(_2\) (X = S, Se) monolayers as two-qubit systems

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发表日期：

2026年7月13日

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M. Ouhammou,
Y. Oussarhan,
F. Omari,
F. Essaadi,
S. El Asri,
M. Jakha,
S. Mouslih,
M. Ouali,
S. Taj,
B. Manaut

摘要

We theoretically investigate laser-controlled quantum correlations in WX \(_2\) (X = S, Se) monolayer dichalcogenides, modeled as effective two-qubit systems governed by a low-energy Hamiltonian including intrinsic spin-orbit coupling and light-matter interaction. Dissipative effects are incorporated through the Milburn intrinsic decoherence formalism to account for decoherence mechanisms inherent to realistic solid-state environments. We analyze the behavior of concurrence, total coherence, local coherence, and correlated coherence under variations of laser field strength, frequency, and polarization. In the absence of irradiation, quantum correlations rapidly diminish and remain negligible. Laser driving activates and stabilizes quantum resources, leading to non-trivial dynamical regimes. Entanglement exhibits a non-monotonic dependence on field strength, with an optimal intermediate regime maximizing concurrence before strong-field-induced decoherence suppresses correlations. We demonstrate that laser frequency critically determines the stability window of entanglement: higher-frequency sources (Nd:YAG and He-Ne) promote broader and more robust correlation regions through enhanced photon-assisted interband transitions, whereas low-frequency excitation (CO \(_2\) ) yields narrower stability intervals. Polarization further acts as a selective control parameter, with linear polarization maximizing both concurrence and correlated coherence, highlighting the importance of directional field-matter coupling. A comparative analysis shows that WSe \(_2\) displays enhanced robustness relative to WS \(_2\) , which is attributed to the combined influence of its stronger spin-orbit interaction, smaller band gap, and modified low-energy band structure. Our results establish laser intensity, frequency, and polarization as complementary external control parameters for engineering and stabilizing quantum resources in transition metal dichalcogenide monolayers, paving the way for optically tunable solid-state platforms for quantum information and spintronic technologies.