Creating a Superposition of Unknown Quantum States.

@article{Oszmaniec2016CreatingAS,
  title={Creating a Superposition of Unknown Quantum States.},
  author={Michał Oszmaniec and Andrzej Grudka and Michał Horodecki and Antoni W{\'o}jcik},
  journal={Physical review letters},
  year={2016},
  volume={116 11},
  pages={
          110403
        }
}
The superposition principle is one of the landmarks of quantum mechanics. The importance of quantum superpositions provokes questions about the limitations that quantum mechanics itself imposes on the possibility of their generation. In this work, we systematically study the problem of the creation of superpositions of unknown quantum states. First, we prove a no-go theorem that forbids the existence of a universal probabilistic quantum protocol producing a superposition of two unknown quantum… 

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