Phys. Rev. A 78, 043816 (2008) [5 pages]Strong low-frequency quantum correlations from a four-wave-mixing amplifierReceived 7 January 2008; published 15 October 2008 Using a simple scheme based on nondegenerate four-wave mixing in a hot vapor, we generate bright twin beams which display a quantum noise reduction in the intensity difference of more than 8 dB. The absence of a cavity makes the system immune to external perturbations, and strong quantum noise reduction is observed at frequencies as low as 4.5 kHz and over a large frequency range. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.78.043816
DOI:
10.1103/PhysRevA.78.043816
PACS:
42.50.Gy, 42.50.Dv
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