Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 19, Pages 4267-4270Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.4267
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We report on the generation of a continuous variable Einstein-Podolsky-Rosen (EPR) entanglement using an optical fiber interferometer. The Kerr nonlinearity in the fiber is exploited for the generation of two independent squeezed beams. These interfere at a beam splitter and EPR entanglement is obtained between the output beams. The correlation of the amplitude (phase) quadratures is measured to be 4.0 +/- 0.2 (4.0 +/- 0.4) dB below the quantum noise limit. The sum criterion for these squeezing variances 0.80 +/- 0.03 < 2 verifies the nonseparability of the state. The product of the inferred uncertainties for one beam (0.64 +/- 0.08) is well below the EPR limit of unity.
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