Cloning of Gaussian states by linear optics

Abstract

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.

8 pages, 7 figures

References in corpus (1)

• The optimal cloning of quantum coherent states is non-Gaussian

Cited by in corpus (8)

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• Teleportation of two-mode squeezed states
• Experimental continuous variable cloning of partial quantum information
• Quantum Cloning of Continuous Variable Entangled States
• Broadcasting of continuous variable entanglement
• Optimal multicopy asymmetric Gaussian cloning of coherent states
• Improving information/disturbance and estimation/distortion trade-offs with non universal protocols
• Selective cloning of Gaussian states by linear optics