Revisiting Quantum Discord for Two-Qubit X States: The Error Bound to an Analytical Formula

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• 作者：Min Namkung ; Jinho Chang ; Jaehee Shin230
• 关键词：Quantum discord ; Quantum correlation
• 刊名：International Journal of Theoretical Physics
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：54
• 期：9
• 页码：3340-3349
• 全文大小：291 KB
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• 作者单位：Min Namkung (1)
  Jinho Chang (1)
  Jaehee Shin (1)
  Younghun Kwon (1)
  
  1. Department of Physics, Hanyang University, Ansan, Kyunggi-Do, 425-791, South Korea
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Physics
  Quantum Physics
  Elementary Particles and Quantum Field Theory
  Mathematical and Computational Physics
  
• 出版者：Springer Netherlands
• ISSN：1572-9575

文摘

In this article, we investigate the error bound of quantum discord, obtained from the analytic formula of Ali et al. (Phys. Rev. A 81, 042105, 2010) for the case of general X states and from the analytic formula of Fanchini et al. (Phys. Rev. A 81, 052107, 2010) for the case of symmetric X states. For this purpose we consider 3-element POVM. We find that the results of Ali et al. and Fanchini et al. may have the worst-case errors of 0.004565 and 0.0009, respectively.