Abstract

Quantum correlation between signal and idler beams at 0.8 and $1.5\mu \text{m}$ was experimentally observed by using an above-threshold optical parametric oscillator based on a periodically poled ${\text{KTiOPO}}_4$ crystal. The measured quantum noise reduction in the intensity difference of the twin beams was 2.5 dB. The system presented here is of interest for long-distance quantum information processing.

© 2010 Optical Society of America

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