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Revisiting Quantum Discord for Two-Qubit X States: The Error Bound to an Analytical Formula
- Authors
- Namkung, Min; Chang, Jinho; Shin, Jaehee; Kwon, Younghun
- Issue Date
- Sep-2015
- Publisher
- Kluwer Academic/Plenum Publishers
- Keywords
- Quantum discord; Quantum correlation
- Citation
- International Journal of Theoretical Physics, v.54, no.9, pp.3340 - 3349
- Indexed
- SCIE
SCOPUS
- Journal Title
- International Journal of Theoretical Physics
- Volume
- 54
- Number
- 9
- Start Page
- 3340
- End Page
- 3349
- ISSN
- 0020-7748
- Abstract
- 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.
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Related Researcher
- Kwon, Young hun
- COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY (DEPARTMENT OF APPLIED PHYSICS)