Dynamics of Quantum Discord of Two-Qubit Coupled with a Vacuum Cavity |
| |
Authors: | Rui-Hua Xiao Zhan-Ying Guo Shi-Qun Zhu Jian-Xing Fang |
| |
Institution: | 1. School of Physical Science and Technology, Soochow University, Suzhou, Jiangsu, 215006, People’s Republic of China 2. Department of Physics, Jiaozuo Normal College, Jiaozuo, Henan, 454001, People’s Republic of China 3. School of Physical Science and Technology, Suzhou University, Suzhou, Jiangsu, 215006, People’s Republic of China
|
| |
Abstract: | The dynamical behaviors of quantum discord between two atoms coupled with a vacuum cavity are investigated. If the two qubits are initially prepared in two extended Werner-like states, the quantum discord and entanglement can be numerically calculated. There are remarkable differences between the time evolutions of the quantum discord and entanglement under the same conditions. These results imply that quantum discord is not zero for some unentangled states and in some regions entanglement can disappear completely. A large amount of quantum discord exists between the two-qubit. Thus, the quantum discord is more robust than entanglement for the quantum system exposed to the environment. The quantum discord shows sudden change and its existence depends on the initial state of the system. This property of quantum discord may have important implications for experimental characterization of quantum phase transitions. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|