Abstract
An analytical solution for a master equation describing the dynamics of a qubit interacting with a nonlinear Kerr-like cavity through intensity-dependent coupling is established. A superposition of squeezed coherent states is propped as the initial cavity field. The dynamics of the entangled qubit-cavity states are explored by negativity for different deformed function of the intensity-dependent coupling. We have examined the effects of the Kerr-like nonlinearity and the qubit-cavity detuning as well as the phase cavity damping on the generated entanglement. The intensity-dependent coupling increases the sensitivity of the generated entanglement to the phase-damping. The stability and the strength of the entanglement are controlled by the Kerr-like nonlinearity, the qubit-cavity detuning, and the initial cavity non-classicality. These physical parameters enhance the robustness of the qubit-cavity entanglement against the cavity phase-damping. The high initial cavity non-classicality enhances the robustness of the qubit-cavity entanglement against the phase-damping effect.
Highlights
The study of quantum coherence dynamics induced by open nonlinear qubit-photon systems has recently become a significant area that contributes to the development of potential quantum information applications [1,2,3,4,5,6]
We analytically solved the master equation of the phase cavity damping effect to explore the dynamics of a qubit interacting off-resonantly with a nonlinear Kerrlike cavity with intensity-dependent coupling
For different cases of the intensity-dependent coupling, the generated entanglement is explored under the effects of the Kerr-like nonlinearity, qubit-cavity detuning, the phase-damping as well as for two different initial coherent states
Summary
The study of quantum coherence dynamics induced by open nonlinear qubit-photon systems has recently become a significant area that contributes to the development of potential quantum information applications [1,2,3,4,5,6]. We suggest here a new superposition scheme of squeezed coherent states to prepare a nonclassical light cavity field with a strong non-classicality. Resources of the nonlinearity effects in qubit-photon interactions (including Kerr-like nonlinearity and intensity-dependent coupling) were realized experimentally in artificial qubit systems as superconducting circuits [27,28], optomechanical systems [29]. The dynamics of quantum correlations in several qubit-photon systems were investigated without the effects the coupling to the surrounding environment [41,42,43,44]. We analyze the effects of intensity-dependent coupling, Kerr nonlinearity, phase cavity damping and qubit-cavity detuning on the dynamics of the qubit-cavity entanglement.
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