Entanglement dynamics for two interacting spins

Chaymae Boukacem, Mouhcine Yachi, Oussama Latifi +3 more

Francesca Fassioli, Alexandra Olaya-Castro, Neil F. Johnson

It has recently been shown that interactions among the spins of a bath can result in an effective suppression of the decoherence of a single qubit embedded in a multi-spin environment. However, the effects of such intrabath interaction on the dynamics of entanglement are still not well understood. Here we study the dynamics of a system composed of two entangled qubits coupled to (1) independent self-interacting spin baths, and (2) a common self-interacting spin bath. We find that, as in the case of a single qubit, strong interactions among the spins in the bath may induce an effective decoupling between the bath and the system—this in turn suppresses the loss of entanglement that a non-, or weakly, interacting bath would typically cause. However we find that the intrabath interaction strength needed to achieve such effects is much larger than in the single qubit case, especially when the two qubits share the same environment. Our results illustrate the system's size effects in the entanglement sharing condition, where the entanglement within the bath limits the entanglement between the bath and the system.

Cuixia Wang, Ding Xiong, Guoqiang Huang +1 more

Xiu-Xing Zhang

The entanglement dynamics of two qubits interacting with an anisotropic XY spin environment are investigated.The results indicate that the entanglement of the two qubits can be manipulated by adjusting the value of anisotropic interaction.The universality property of the environment can be judged by the different dynamical behavior of entanglement influenced by the anisotropic interaction.

Pierre Wendenbaum, Bruno G. Taketani, E. Kajari +2 more

Mohammad Reza Soltani, S. Mahdavifar, Maryam Mahmoudi +1 more

Introduction: In this study, we investigate the dynamics of the Entanglement in a two-spin system with long-range interaction.Method: For this purpose, we use negativity as the entanglement measurement. Using the time evolution operator, we obtain entanglement dynamics of the system at time t. We consider two different initial states and investigate the dynamical behavior of the system for all of them separately. Finally, we consider both J and D as a function of R and then study the time evolution of the entanglement in different R.Results: We find that in the long-range interaction, the R dependence of the dynamical behavior in the two systems is different. Depending on the initial states, the DM interaction and the magnetic field have no effect on the entanglement dynamics.