Delaying disappearance of entanglement by the linear modulation of atom-field coupling

Abstract

By considering a double Jaynes-Cummings (JC) model with linear modulation of the atom-field coupling coefficients, we investigate the entanglement evolution between two atoms, and focuss on the effect of the linear sweep on the entanglement. The results show that the entanglement is very sensitive to the linear modulation of the atom-field coupling coefficients. Both for onephoton processes and for two-photon processes, the disappearance of the initial entanglement is delayed due to the linear modulation as compared to the double standard JC model, and the delayed time is long or short depending on the value of the parameters in the modulation function. Moreover, the entanglement of the two atoms in the double standard JC model disappears periodically. However, this periodicity is completely lost in the linear modulation case. In addition, the larger the photon numbers in the cavities, the shorter the delayed time of the disappearance of the initial entanglement.

Dynamics of Entanglement in Jaynes–Cummings Nodes with Nonidentical Qubit-Field Coupling Strengths

“…Generation and preservation of the quantum entanglement between the qubit and field have played an important role for both fundamental quantum theories and experiments , and they are still a challenge for real applications [38][39][40][41][42][43][44][45][46][47][48], such as quantum key distribution and teleportation. In theory, it is feasible to generate and preserve quantum entanglement based on the well-known Jaynes-Cummings model [49][50][51][52][53][54][55][56]. There have some physical systems dealing with quantum correlation and entanglement through autocorrelation function recently [57][58][59][60], such as semiconductor microcavities [59] and optomechanics [60].…”

The Control of Entanglement in a Damped Jaynes-Cummings Model by Transient Effects

“…We showed that the entanglement sudden death can be controlled by these transient e¤ects. Transient e¤ects has also been studied elsewhere [16,17].…”

Entanglement of two superconducting charge qubits with transient effects

“…situations, these transient effects can be realized by a very slow shift or a sudden jump of the interacting field. The influence of the transient effects on the entanglement was considered elsewhere for different systems[13][14][15].The Hamiltonian of the system becomes ( )…”