Revisiting Quantum Discord for Two-Qubit X States: The Error Bound to an Analytical Formula
- Title
- Revisiting Quantum Discord for Two-Qubit X States: The Error Bound to an Analytical Formula
- Author
- 권영헌
- Keywords
- Quantum discord; Quantum correlation; ENTANGLEMENT
- Issue Date
- 2015-09
- Publisher
- SPRINGER/PLENUM PUBLISHERS
- Citation
- INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS, v. 54, No. 9, Page. 3340-3349
- 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.
- URI
- https://link.springer.com/article/10.1007/s10773-015-2573-7http://hdl.handle.net/20.500.11754/39327
- ISSN
- 0020-7748; 1572-9575
- DOI
- 10.1007/s10773-015-2573-7
- Appears in Collections:
- COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > APPLIED PHYSICS(응용물리학과) > Articles
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