Low-Noise Amplification of a Continuous Variable Quantum State
arXiv:0906.5024 · doi:10.1117/12.851881
Abstract
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.
To appear in Physical Review Letters July 3rd. 4 pages, 4 figures