ALL-FIBRE SOURCE OF CONTINUOUS VARIABLE ENTANGLED LIGHT
Akhilesh P. Nandan, Metin Sabuncu, J. Heersink, O. Glöckl, Gerd Leuchs, Ulrik L. Andersen · International Journal of Modern Physics B · 2006
We experimentally demonstrate the production of continuous variable entanglement of femto second laser pulses from an all-fibre asymmetric Sagnac interferometer exploiting the Kerr effect. Contrary to the experiment of Silberhorn et al. [Phys. Rev. Lett. 86, 4267 (2001)], the asymmetric coupler in the Sagnac loop is fully integrated in the fibre, making the source extremely compact, reliable and robust. Employing a simple detection scheme, comprising a beam splitter and two intensity detectors, we clearly observe quantum correlations of conjugate quadratures, hereby witnessing entanglement.