01032nas a2200181 4500008004100000245003700041210003700078260001500115300001100130490000700141520058000148100001800728700001700746700001800763700002000781700001200801856003700813 2008 eng d00aExistence of Universal Entangler0 aExistence of Universal Entangler c2008/01/01 a0121030 v493 a A gate is called entangler if it transforms some (pure) product states to
entangled states. A universal entangler is a gate which transforms all product
states to entangled states. In practice, a universal entangler is a very
powerful device for generating entanglements, and thus provides important
physical resources for accomplishing many tasks in quantum computing and
quantum information. This Letter demonstrates that a universal entangler always
exists except for a degenerated case. Nevertheless, the problem how to find a
universal entangler remains open.
1 aChen, Jianxin1 aDuan, Runyao1 aJi, Zhengfeng1 aYing, Mingsheng1 aYu, Jun uhttp://arxiv.org/abs/0704.1473v2