Dynamics and protection of quantum discord via cavity engineering. (14th November 2017)

• Record Type: Journal Article
• Authors: Basit, Abdul; Ali, Hamad; Badshah, Fazal; Zhang, Haiyang; Ge, Guo-Qin
• Is Part Of: Laser physics letters. Volume 14:Number 12(2017:Dec.)
• Publication Date: 2017-11-14
• Subjects: quantum discord -- cavity engineering -- quantum information; Lasers -- Periodicals; Physics -- Periodicals; 621.366
• DOI: 10.1088/1612-202X/aa8bc8
• Languages: English
• ISSNs: 1612-2011

Abstract

Abstract: Exploring strategies to protect quantum correlations from the detrimental effects of their surroundings is crucial in the field of quantum computing and information sciences. For this purpose, we consider a simple engineered environment consisting of two noninteracting separated qubits, each embedded in a single-mode lossy cavity which is further connected to another lossy cavity. We investigate the dynamics and protection of quantum discord for the initially maximum entangled state in the weak and strong coupling regimes between the qubits and their corresponding cavities. It is found that the quantum discord can be preserved efficiently for a much longer time by adjusting the hopping strengths between the two coupled cavities. In addition, if the secondary cavity is perfect then a stationary quantum discord between the two qubits arises after certain damping oscillations. Interestingly, the magnitude of the stationary quantum discord can be maximized by increasing the coupling strengths of the two cavities.