Reversibility of continuous-variable quantum cloning

Details Reversibility of continuous-variable quantum cloning Reversibility of continuous-variable quantum cloning

2003-10-20

arxiv.org/abs/quant-ph/0310123v1

Phys. Rev. A 69, 012314 (2004).

Physics

Quantum Physics

7 pages, 5 figures

Scientific paper

10.1103/PhysRevA.69.012314

We analyze a reversibility of optimal Gaussian $1\to 2$ quantum cloning of a coherent state using only local operations on the clones and classical communication between them and propose a feasible experimental test of this feature. Performing Bell-type homodyne measurement on one clone and anti-clone, an arbitrary unknown input state (not only a coherent state) can be restored in the other clone by applying appropriate local unitary displacement operation. We generalize this concept to a partial LOCC reversal of the cloning and we show that this procedure converts the symmetric cloner to an asymmetric cloner. Further, we discuss a distributed LOCC reversal in optimal $1\to M$ Gaussian cloning of coherent states which transforms it to optimal $1\to M'$ cloning for $M'

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