Generation of continuous variable quantum entanglement using a fiber optical parametric amplifier

Optics Letters
Xueshi GuoZ Y Ou

Abstract

We demonstrate the experimental generation of quadrature amplitude entanglement in the 1550 nm band by using a fiber optical parametric amplifier. The measured noise variances of the difference and sum of the quadrature amplitudes of the pulsed signal and idler twin beams fall below the shot noise limit by about 1 and 0.8 dB (4.2 and 3.6 dB after the correction for efficiency), respectively, showing that the inseparability criterion of Einstein-Podolsky-Rosen entanglement I<2 is satisfied. Our investigation reveals that the quality of the measured entanglement can be further improved by increasing the transmission efficiency of the twin beams and by optimizing the temporal mode matching of the two sets of homodyne detection systems.

References

Oct 4, 2000·Physical Review Letters·L M DuanP Zoller
Mar 24, 2005·Physical Review Letters·Xiaoying LiPrem Kumar
Nov 28, 2007·Optics Letters·J E SharpingP Kumar
Jun 4, 2008·Physical Review Letters·V BoyerP D Lett
Apr 15, 2010·Optics Express·Rüdiger Paschotta
Aug 3, 2011·The Review of Scientific Instruments·B M SparkesT Symul
Sep 26, 2012·Physical Review Letters·C PolycarpouM Bellini

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