Phase manipulation of entanglement and quantum discord
State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University Guangzhou 510275, China
Accepted: 26 October 2010
Reliable and achievable quantum information processing depends greatly on high-efficiency and successful manipulation of non-classical correlations in quantum systems. In this letter, our result manifests that these correlations characterized by entanglement and quantum discord are influenced profoundly by the highly controllable relative phase difference, which originates from the time delay between coherent double laser pulses, and therefore demonstrates its importance in manipulating such relations. In particular, coherent trapping of entanglement and quantum discord is accomplished under certain conditions.
PACS: 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) / 03.67.Bg – Entanglement production and manipulation / 42.50.Ex – Optical implementations of quantum information processing and transfer
© EPLA, 2010