Heralded multiphoton GHZ-type polarization entanglement generation from parametric down-conversion sources

Abstract

We propose a scheme to generate an N-photon GHZ-type polarization-entangled state from 2N − 1 parametric down-conversion sources, by using only linear optical elements and projective measurements. Successful preparation is heralded by detecting 3N − 2 photons with ideal number-resolving photon detectors.

Keywords:

• heralded entanglement
• parametric down-conversion
• GHZ-type entanglement

Acknowledgements

This work was funded by National Fundamental Research Program (Grant No. 2006CB921907 and No. 2009CB929601), National Natural Science Foundation of China (Grant Nos. 60621064, 10674128 and 10774139), Innovation Funds from Chinese Academy of Sciences, ‘Hundreds of Talents’ program of Chinese Academy of Sciences, Program for New Century Excellent Talents in University, A Foundation for the Author of National Excellent Doctoral Dissertation of PR China (Grant 200729).