Journal of East China Normal University(Natural Sc

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The quantum correlation evolution properties of entangled coherent states in noisy environments

YANG Zhi-gang   

  1. State Key Laboratory of Precision Spectroscopy in Science and Technology, East China Normal University, Shanghai 200062, China
  • Received:2015-06-24 Online:2016-07-25 Published:2016-09-29


In this paper, quantum correlation in an entangled coherent state (ECS) is extensively studied with four popular quantifiers, namely, entanglement of formation (E), quantum discord (QD), measurement-induced disturbance (MID) and geometric measure of quantum discord (GQD). Besides, the influence of amplitude damping noises on the quantum correlation is treated. It is found that, E decreases faster than QD.E (QD or MID) behaves quite similarly in an asymmetric and a symmetric noisy channel. What’s more, it is obvious that the Bell state is not always more entangled than the ECS.

Key words: entangled coherent state, amplitude damping channel, quantum correlation