Physics – Quantum Physics
Scientific paper
2010-04-09
Phys. Rev. A 81, 062341 (2010)
Physics
Quantum Physics
Minor changes, replaced by the published version. Any comments are welcome!
Scientific paper
10.1103/PhysRevA.81.062341
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.
Gheorghiu Vlad
Looi Shiang Yong
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