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Two Color Entanglement
We report on the generation of entangled states of light between the
wavelengths 810 and 1550 nm in the continuous variable regime. The fields were
produced by type I optical parametric oscillation in a standing-wave cavity
build around a periodically poled potassium titanyl phosphate crystal, operated
above threshold. Balanced homodyne detection was used to detect the
non-classical noise properties, while filter cavities provided the local
oscillators by separating carrier fields from the entangled sidebands. We were
able to obtain an inseparability of I=0.82, corresponding to about -0.86 dB of
non-classical quadrature correlation.Comment: 4 pages, 2 figure