Exploring local quantum Fisher information beyond entanglement of two distant qubits in coupled dissipative cavities via a Waveguide

We explore local quantum Fisher information (QFI) and concurrence entanglement of two distant qubits. Each qubit interacts separately with a dissipative cavity, and the two cavities are coupled via an optical fiber. Under increasing the cavityatom, fiber-cavity, and cavity dissipation couplings, the generation and robustness of the atomic local quantum Fisher information and concurrence quantum information resources are investigated. The frequencies, regularity, and amplitudes of the generated atomic local quantum Fisher information and entanglement can be enhanced while the time disappearance-entanglement intervals are reduced by increasing the fiber-cavity interactions in the presence of the strong cavity-atom couplings. It is shown that The time disappearance-entanglement intervals depend on the fiber-cavity and the cavity-atom interaction couplings. The robustness dynamics of the initial maximal coherence’s local quantum Fisher information and the maximal entanglement’s concurrence can be enhanced by increasing the fiber-cavity coupling. It is found that, in the study cases of the generation and robustness of the local quantum Fisher information and entanglement, the stability of the Local QFI growth and the concurrence degradation (due to the cavity dissipation effects) depend on the atom-cavity, fiber-cavity, and cavity dissipation couplings.