Observation of twin-beam-type quantum correlation in optical fiber

Jay E. Sharping*, Marco Fiorentino, Prem Kumar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

81 Scopus citations

Abstract

We report generation of pulsed twin beams of light through optical parametric amplification in a fiber Sagnac loop. By pumping the Sagnac loop with picosecond pulses at a wavelength near the zero-dispersion wavelength of the fiber, we achieve phase-matched nondegenerate four-wave mixing with gain. For a gain of 2.2, the intensity noises of the amplified signal and the generated idler (conjugate) pulses are found to be correlated by 5.0 dB, and the subtracted noise drops below the shot-noise limit by 1.1 dB (2.6 dB when corrected for losses). We have investigated the gain dependence of the quantum-noise reduction as well as of the intensity noises of the amplified signal and idler pulses. As the gain increases, we observe the onset of excess noise on the idler pulses.

Original languageEnglish (US)
Pages (from-to)367-369
Number of pages3
JournalOptics Letters
Volume26
Issue number6
DOIs
StatePublished - Mar 15 2001

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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