[1] Kwiat P,Weinfurter H,Herzog T et al. Phys Rev Lett,1995;74:4763
[2] Weihs G,Jenewein T,Simon C et al. Phys Rev Lett,1998;81:5039
[3] Bouwmeester D,Pan J W,Matlle K et al. Nature,1997;390:575
[4] Chen G,Bonadeo N H,Stell D G et al. Science,2000;289:1906
[5] Bouwmeester D,Pan J W,Daniell M et al. Phys Rev Lett,1999;82:1345