Low-Noise Amplification of a Continuous Variable Quantum State

Details Low-Noise Amplification of a Continuous Variable Quantum State Low-Noise Amplification of a Continuous Variable Quantum State

2009-06-27

arxiv.org/abs/0906.5024v1

Physics

Quantum Physics

To appear in Physical Review Letters July 3rd. 4 pages, 4 figures

Scientific paper

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 protocols. We demonstrate that amplification and ``cloning'' of one half of a two-mode squeezed state is possible while preserving entanglement.

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