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Enhancing Quantum Discord in Cavity QED by Applying Classical Driving Field |
| QIAN Yi,XU Jing-Bo** |
| Zhejiang Institute of Modern Physics and Physics Department, Zhejiang University, Hangzhou 310027 |
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QIAN Yi, XU Jing-Bo 2012 Chin. Phys. Lett. 29 040302 |
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Abstract We investigate the quantum discord dynamics in a cavity quantum electrodynamics system, which consists of two noninteracting two-level atoms driven by independent optical fields and classical fields, and find that the quantum discord vanishes only asymptotically although entanglement disappears suddenly during the time evolution in the absence of classical fields. It is shown that the amount of quantum discord can be increased by adjusting the classical driving fields because the increasing degree of the amount of quantum mutual information is greater than classical correlation by applying the classical driving fields. Finally, the influence of the classical driving field on the fidelity of the system is also examined.
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Received: 15 October 2011
Published: 04 April 2012
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