ABSTRACT We investigate the dynamics of concurrence, correlated coherence, and local quantum Fisher information (LQFI) in a two‐qubit state governed by the effective low‐energy Hamiltonian of buckled silicene under Milburn intrinsic decoherence. Starting from a Werner‐type Bell state, we analyze how the effective wave vector, initial‐state purity, intrinsic decoherence rate, perpendicular electric field, and Rashba coupling affect the redistribution of quantum resources. The results show that concurrence is the most fragile quantity and decays rapidly under intrinsic decoherence. In contrast, correlated coherence exhibits damped oscillations and can remain finite after entanglement is strongly suppressed, indicating the persistence of shared coherence. The LQFI shows a non‐monotonic behavior, including partial recovery and plateau‐like regimes, revealing local metrological sensitivity beyond entanglement. These findings show that buckled silicene offers a tunable platform for controlling different quantum resources in decohering solid‐state environments.
ABSTRACT We investigate the dynamics of concurrence, correlated coherence, and local quantum Fisher information (LQFI) in a two‐qubit state governed by the effective low‐energy Hamiltonian of buckled silicene under Milburn intrinsic decoherence. Starting from a Werner‐type Bell state, we analyze how the effective wave vector, initial‐state purity, intrinsic decoherence rate, perpendicular electric field, and Rashba coupling affect the redistribution of quantum resources. The results show that concurrence is the most fragile quantity and decays rapidly under intrinsic decoherence. In contrast, correlated coherence exhibits damped oscillations and can remain finite after entanglement is strongly suppressed, indicating the persistence of shared coherence. The LQFI shows a non‐monotonic behavior, including partial recovery and plateau‐like regimes, revealing local metrological sensitivity beyond entanglement. These findings show that buckled silicene offers a tunable platform for controlling different quantum resources in decohering solid‐state environments.
Abstract The thermal behavior of quantum correlations is explored in a two‐qubit system based on nitrogen‐vacancy (NV) centers, using Local Quantum Fisher Information (LQFI), Local Quantum Uncertainty (LQU), and concurrence as quantifiers. These results show that entanglement, measured byconcurrence (CE), decays rapidly with increasing temperature, whereas coherence‐based measures such as LQFI and LQU display greater resilience. The strength of zero‐field splitting plays a key role in shaping quantum correlations, significantly suppressing entanglement at higher values while helping to preserve coherence. External magnetic and electric fields further influence these dynamics–magnetic fields tend to suppress entanglement, while electric fields accelerate its degradation. Dipole–dipole interactions enhance the initial quantum correlations but have a limited effect on their thermal decay. Overall, these findings underscore the robustness of coherence‐based quantum resources and suggest that, while dipole–dipole coupling is more effective at regulating quantum correlations, optimal tuning of system parameters can significantly improve both the generation and preservation of these correlations at finite temperatures.
We investigate the dynamics of local quantum Fisher information and quantum coherence in a two‐qubit system hosted in a molybdenum disulfide monolayer and coupled to a thermal Markovian environment. Initially prepared in a thermal state at temperature T s , the system is connected to a reservoir at a different temperature, allowing the study of quantum‐resource dynamics under thermal nonequilibrium conditions. We show that the electron wave‐vector magnitude k affects the transient regime by enhancing the off‐diagonal elements of the initial density matrix, which increases quantum coherence and, more moderately, local quantum Fisher information. This dependence is progressively suppressed by decoherence, so that the long‐time stationary state becomes independent of k and T s . Moreover, quantum coherence decays monotonically to zero, whereas local quantum Fisher information first decreases and then saturates at a finite asymptotic value. This contrast reflects their different physical nature: coherence depends on off‐diagonal density‐matrix elements, while local quantum Fisher information is sensitive to both populations and coherences. Overall, within the Markovian description, the steady state is controlled by the reservoir, while transient dynamics preserve signatures of the initial state and intrinsic system parameters.
This study aims to investigate the decoherence of the quantum correlation dynamics of two qubit nitrogen-vacancy (NV) centres through local quantum uncertainty (LQU), local quantum Fisher information (LQFI), and concurrence. Using an intrinsic decoherence model, our study investigates how increasing zero-field splitting, external magnetic fields, external electric control fields, dipole-dipole coupling and decoherence affect the generated correlations between two NV centers. It is shown that the system with two nitrogen-vacancy centres can generate strong correlations with certain parameters of zero-field splitting, external magnetic fields, external electric control fields and dipole-dipole coupling. With weak intrinsic decoherence, the generated LQFI, LQU and concurrence exhibit oscillating generations with the same frequency. Most of the time, LQFI and LQU exhibit the same Wigner-Yanase-Fisher correlation, except during strong entanglement intervals. Furthermore, the ability of interactions within a two-qubit system of NV centers to generate two-qubit correlations is weakened by increasing external magnetic fields and zero-field splitting fields. Conversely, increasing external electric control fields and dipole-dipole couplings strengthen the ability of the interactions to generate correlations. Finally, we investigated how an increase in intrinsic decoherence coupling significantly degrades the generated correlations. We also investigated how increasing the external magnetic field, the external electric control field and the dipole-dipole coupling significantly affects these correlation degradations.
The dynamics of trade-off relations between quantum information resources are investigated in a system of two non-interacting qubits, each individually and nonlinearly coupled to coherent cavity fields through intensity-dependent coupling. The qubits are initially prepared in a maximally entangled Bell state, while the cavity fields are assumed to be in coherent states. An exact analytical treatment of the reduced two-qubit density matrix is presented under qubit–cavity detuning and intrinsic decoherence governed by the Milburn model. The time evolutions of first-order coherence, concurrence, intrinsic concurrence and purity are analyzed to elucidate the redistribution of quantum resources. The results confirm that intrinsic concurrence and first-order coherence obey a complementary trade-off relation governed by the purity of the two-qubit state, with standard concurrence acting as a lower bound for intrinsic concurrence throughout the dynamics. The roles of the initial coherent field intensity, qubit–cavity detuning and intrinsic decoherence are examined, showing that nonlinear atom–cavity interactions induce regular oscillatory behavior accompanied by entanglement sudden death and revival phenomena. Increasing the coherent field intensity enhances coherence generation and accelerates entanglement degradation of the generated two-qubit states.
The dynamics of two charged qubits containing Josephson Junctions inside a cavity are investigated under the intrinsic decoherence effect. New types of quantum correlations via local quantum Fisher information and Bures distance norm are explored. We show that we can control the quantum correlations robustness by the intrinsic decoherence rate, the qubit-qubit coupling as well as by the initial coherent states superposition. The phenomenon of sudden changes and the freezing behavior for the local quantum Fisher information are sensitive to the initial coherent state superposition and the intrinsic decoherence.
ABSTRACT We study quantum resources in tilted‐Dirac materials using a thermal state and reservoir‐driven dynamics in dissipative weak‐coupling and memory‐bearing strong‐coupling regimes. In contrast to the usual treatments based on the Bellomo formalism and relying on Bell or Werner states, the present approach starts from a physically motivated thermal state of two qubits whose initial properties are determined by the system temperature and the velocity parameters of the underlying Dirac material. The subsequent dynamics is modeled using the Bellomo formalism for two independent qubits, each locally coupled to an independent reservoir. To characterize the evolution, we analyze coherence quantified by the ‐norm and local quantum Fisher information. Weak, effectively Markovian coupling yields monotonic coherence decay, while local quantum Fisher information depends more strongly on parameters, especially at low reservoir temperatures; varying velocity parameters together obscures their individual effects. With strong, memory‐bearing coupling, coherence remains suppressed at long times, whereas local quantum Fisher information decreases then recovers to a large asymptotic value. The two measures thus respond differently to thermal, material, and reservoir effects, without implying general practical metrological superiority of local quantum Fisher information.