Stationary State Entanglement and Total Correlation of Two Qubits or Qutrits

Abstract

We investigate the mutual information and entanglement of stationary state of two locally driven qubits under the influence of collective dephasing. It is shown that both the mutual information and the entanglement of two qubits in the stationary state exhibit damped oscillation with the scaled action time γT of the local external driving field. It means that we can control both the entanglement and total correlation of the stationary state of two qubits by adjusting the action time of the driving field. We also consider the influence of collective dephasing on entanglement of two qutrits and obtain the sufficient condition that the stationary state is entangled.

Negativity as entanglement degree of the Jaynes–Cummings model

“…The study of entangling two mode thermal fields through the quantum erasing process, in which an atom is coupled with two mode fields via the interaction governed by the two-mode two-photon JCM has been made in [24]. In [25] the authors have considered the time-dependent JCM consists of two-mode interacting with an effective two-level atom and studied the degree of entanglement.…”

“…Considerable interest has also been devoted to the entanglement properties of the generalized JCM to include multi-photon interaction, nonlinearity of both the field and the intensity-dependent atom-field coupling, stark effect and nonresonance coupling [21,22,23]. The study of entangling two mode thermal fields through the quantum erasing process, in which an atom is coupled with two mode fields via the interaction governed by the two-mode two-photon JCM has been made in [24]. In [25] the authors have considered the time-dependent JCM consists of two-mode interacting with an effective two-level atom and studied the degree of entanglement.…”

Controlling entanglement sudden death and birth in cavity QED

“…Recently, the manipulation of quantum entanglement for the system of cavity QED has been extensively investigated [5,6,7,8,9,10,11,12,13].…”

“…A cavity quantum electrodynamics(QED) system is a useful tool to create the entanglement between atoms in cavities and establish quantum communications between different optical cavities. Recently, the manipulation of quantum entanglement for the system of cavity QED has been extensively investigated [5,6,7,8,9,10,11,12,13].…”