Existence of universal entangler

Publication Type:
Journal Article
Journal of Mathematical Physics, 2008, 49 (1)
Issue Date:
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A gate is called an 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 paper demonstrates that a universal entangler always exists except for a degenerated case. Nevertheless, the problem how to find a universal entangler remains open. © 2008 American Institute of Physics.
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