Lower bound of concurrence for qubit systems

  • Authors:

  • Xue-Na Zhu;Shao-Ming Fei

  • Affiliations:

  • Department of Mathematics, South China University of Technology, Guangzhou, P.R.China 510640;School of Mathematical Sciences, Capital Normal University, Beijing, China 100048 and Max-Planck-Institute for Mathematics in the Sciences, Leipzig, Germany 04103

  • Venue:
  • Quantum Information Processing
  • Year:
  • 2014

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Abstract

We study the concurrence of four-qubit quantum states and provide analytical lower bounds of concurrence in terms of the monogamy inequality of concurrence for qubit systems. It is shown that these lower bounds are able to improve the existing bounds and detect entanglement better. The approach is generalized to arbitrary qubit systems.