Revisiting Quantum discord for two-qubit X states: Error bound to Analytical formula

• DOI: 10.48550/arxiv.1404.6329
• Publication Date: 2014-01-01
• Authors: Min Namkung; Jinho Chang; Jaehee Shin; Younghun Kwon
• Keywords: Quantum Physics; FOS: Physical sciences; Quantum Physics (quant-ph)

In this article, we investigate the error bound of quantum discord, obtained by analytic formula Ali et al.[Phys. Rev. A 81(2010), 042105] in case general X states and Fanchini 052107] symmetric states. We show that results et. al. to may have worst-case 0.004565 0.0009 respectively.