Existence of Universal Entangler

TitleExistence of Universal Entangler
Publication TypeJournal Article
Year of Publication2008
AuthorsChen, J, Duan, R, Ji, Z, Ying, M, Yu, J
JournalJournal of Mathematical Physics
Date Published2008/01/01

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.

Short TitleJ. Math. Phys.