Existence of Universal Entangler

Details Existence of Universal Entangler Existence of Universal Entangler

2007-04-11

arxiv.org/abs/0704.1473v2

Physics

Quantum Physics

4 pages

Scientific paper

10.1063/1.2829895

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.

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