Cloning of continuous quantum variables

@article{Cerf2000CloningOC,
  title={Cloning of continuous quantum variables},
  author={Cerf and Ipe and Rottenberg},
  journal={Physical review letters},
  year={2000},
  volume={85 8},
  pages={
          1754-7
        }
}
The cloning of quantum variables with continuous spectra is analyzed. A Gaussian quantum cloning machine is exhibited that copies equally well the states of two conjugate variables such as position and momentum. It also duplicates all coherent states with a fidelity of 2/3. More generally, the copies are shown to obey a no-cloning Heisenberg-like uncertainty relation. 
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