Geometric interpretation for A-fidelity and its relation with Bures fidelity

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A geometric interpretation for the A-fidelity between two states of a qubit system is presented, which leads to an upper bound of the Bures fidelity. The metrics defined based on the A-fidelity are studied by numerical method. An alternative generalization of the A-fidelity, which has the same geometric picture, to a $N$-state quantum system is also discussed.
4 pages, 1 figure. Phys. Rev. A

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Quantum Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/213683

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0809.1786
 http://arxiv.org/abs/0809.1786
 Phys. Rev. A 78, 064305 (2008)
 doi:10.1103/PhysRevA.78.064305

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arXiv