Cloning of Gaussian states by linear optics

Details Cloning of Gaussian states by linear optics Cloning of Gaussian states by linear optics

2006-01-24

arxiv.org/abs/quant-ph/0601164v1

Phys. Rev. A 73, 062330 (2006).

Physics

Quantum Physics

8 pages, 7 figures

Scientific paper

10.1103/PhysRevA.73.062330

We analyze in details a scheme for cloning of Gaussian states based on linear optical components and homodyne detection recently demonstrated by U. L. Andersen et al. [PRL 94 240503 (2005)]. The input-output fidelity is evaluated for a generic (pure or mixed) Gaussian state taking into account the effect of non-unit quantum efficiency and unbalanced mode-mixing. In addition, since in most quantum information protocols the covariance matrix of the set of input states is not perfectly known, we evaluate the average cloning fidelity for classes of Gaussian states with the degree of squeezing and the number of thermal photons being only partially known.

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