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16 April 2010 Low-noise amplification of a continuous-variable quantum state
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We present an experimental realization of a low-noise, phase-insensitive optical amplifier using a four-wave mixing interaction in hot Rb vapor. Performance near the quantum limit for a range of amplifier gains, including near unity, can be achieved. Such low-noise amplifiers are essential for so-called quantum cloning machines and are useful in quantum information networks and protocols. We demonstrate that amplification and ''cloning'' of one half of a two-mode squeezed state is possible while preserving entanglement. The inseparability criterion between the two original modes remains satisfied for small to large gains, while the EPR criterion is satisfied for a smaller range. This amplification of quantum correlations paves the way for optimal cloning of a bipartite entangled state.
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R. C. Pooser, A. M. Marino, V. Boyer, K. M. Jones, and P. D. Lett "Low-noise amplification of a continuous-variable quantum state", Proc. SPIE 7702, Quantum Information and Computation VIII, 77020O (16 April 2010);

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