1. Construction of equally entangled bases in arbitrary dimensions via quadratic Gauss sums and graph states
- Author
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Shiang Yong Looi and Vlad Gheorghiu
- Subjects
Physics ,Quantum Physics ,Pure mathematics ,Open problem ,FOS: Physical sciences ,Graph theory ,Mathematical Physics (math-ph) ,Quantum entanglement ,Quadratic Gauss sum ,16. Peace & justice ,Graph state ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,010305 fluids & plasmas ,Quantum mechanics ,0103 physical sciences ,Bipartite graph ,Orthonormal basis ,Quantum Physics (quant-ph) ,010306 general physics ,Mathematical Physics ,No-communication theorem - Abstract
Recently [Karimipour and Memarzadeh, Phys. Rev. A 73, 012329 (2006)] studied the problem of finding a family of orthonormal bases in a bipartite space each of dimension $D$ with the following properties: (i) The family continuously interpolates between the product basis and the maximally entangled basis as some parameter $t$ is varied, and (ii) for a fixed $t$, all basis states have the same amount of entanglement. The authors derived a necessary condition and provided explicit solutions for $D \leq 5$ but the existence of a solution for arbitrary dimensions remained an open problem. We prove that such families exist in arbitrary dimensions by providing two simple solutions, one employing the properties of quadratic Gauss sums and the other using graph states. The latter can be generalized to multipartite equientangled bases with more than two parties., Comment: Minor changes, replaced by the published version. Any comments are welcome!
- Published
- 2010
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