A study on quantum discord in Gaussian states

作者：Yang, Xiong^*; Huang, Guo Hui; Fang, Mao Fa

来源：Optics Communications, 2015, 341: 91-96.

DOI：10.1016/j.optcom.2014.11.069

• Quantum discord
• Gaussian states
• Characteristic function
• Thermal bath

We consider analytically the dynamic behaviors of quantum correlation measured by a quantum discord between two mode Gaussian states coupled to a common squeezed thermal reservoir. We derive the conditions to produce and enlarge quantum discord. If the two modes are initially in factorized squeezed states, we reveal that the thermal bath can not only produce but also amplify the two-mode quantum discord provided that initial squeezing parameters can control properly. Whereas two-modes are initially in a two-mode squeezed vacuum state, whether quantum discord is increased or reduced has a strong relationship with the difference between the squeezing parameters of thermal bath and of considered state.

• 出版日期2015-4-15
• 单位湖南师范大学