Universal cloning of continuous quantum variables

Details Universal cloning of continuous quantum variables Universal cloning of continuous quantum variables

1999-09-11

arxiv.org/abs/quant-ph/9909037v2

Phys. Rev. Lett. 85 (2000) 1754

Physics

Quantum Physics

4 pages, RevTex. Minor revisions, added explicit cloning transformation, added references

Scientific paper

10.1103/PhysRevLett.85.1754

The cloning of quantum variables with continuous spectra is analyzed. A universal - or 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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