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Entangling power of two-qubit gates on mixed states

AuthorsGuan, Zhe; He, Huan; Han, Yong-Jian; Li, Chuan-Feng; Galve, Fernando ; Guo, Guang-Can
Issue Date23-Jan-2014
PublisherAmerican Physical Society
CitationPhysical Review - Section A - Atomic Molecular and Optical Physics 89: 012324 (2014)
AbstractThe ability to reach a maximally entangled state from a separable one through the use of a two-qubit unitary operator is analyzed for mixed states. This extension from the known case of pure states shows that there are at least two families of gates which are able to give maximum entangling power for all values of purity. It is notable that one of this gates coincides with a maximum discording one. We give analytical proof that such gate is indeed a perfect entangler at all purities and give numerical evidence for the existence of the second one. Furthermore, we find that there are other gates, many in fact, which are perfect entanglers for a restricted range of purities. This highlights the fact that many perfect entangler gates could in principle be found if a thorough analysis of the full parameter space is performed. © 2014 American Physical Society.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevA.89.012324
Identifiersdoi: 10.1103/PhysRevA.89.012324
issn: 1050-2947
e-issn: 1094-1622
Appears in Collections:(IFISC) Artículos
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