%0 Journal Article
%J Journal of Mathematical Physics
%D 2008
%T Existence of Universal Entangler
%A Jianxin Chen
%A Runyao Duan
%A Zhengfeng Ji
%A Mingsheng Ying
%A Jun Yu
%X 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.
%B Journal of Mathematical Physics
%V 49
%P 012103
%8 2008/01/01
%G eng
%U http://arxiv.org/abs/0704.1473v2
%N 1
%! J. Math. Phys.
%R 10.1063/1.2829895