Entanglement Generation in a Two-Qubit System Coupled to Vacuum Electromagnetic Field

Saeed Pegahan, Morteza Soltani, Fardin Kheirandish

Li-Tuo Shen, Wen-Zhang Li, Rongxin Chen +1 more

Yiquan Yang, Jiawei Hu, Hongwei Yu

We investigate the entanglement dynamics of two uniformly accelerated atoms with the same acceleration perpendicular to their separation. The two-atom system is treated as an open system coupled with fluctuating electromagnetic fields in the Minkowski vacuum, and in the Born--Markov approximation the master equation that describes the completely positive time evolution of the two-atom system is derived. In particular, we investigate the phenomena of entanglement degradation, generation, revival and enhancement. As opposed to the scalar-field case, the entanglement dynamics is crucially dependent on the polarization directions of the atoms. For the two-atom system with certain acceleration and separation, the polarization directions of the atoms may determine whether entanglement generation, revival or enhancement happens, while for entanglement degradation, they affect the decay rate of entanglement. A comparison between the entanglement evolution of accelerated atoms and that of static ones immersed in a thermal bath at the Unruh temperature shows that they are the same only when the acceleration is extremely small.

Andrzej Veitia

Eugene K. Bashkirov, Башкиров Е. К

In the present paper we investigated the dynamics of two dipole-coupled superconducting qubits prepared in an entangled state and interacting with two modes of the vacuum electromagnetic fields of two independent resonators. It is shown that the dipole-dipole interaction of qubits is an effective mechanism for the stabilization of qubits entanglement.

Anonymous