2003
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                            S. Gaertner; M. Bourennane; M. Eibl; C. Kurtsiefer; H. Weinfurter
                    
                    
                    
 High fidelity four photon entanglement source
 Applied Physics B 77, 803 (2003)
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                            O. Schulz; R. Steinhübl; M. Weber; B.-G. Englert; C. Kurtsiefer; H. Weinfurter
                    
                    
                    
 Ascertaining the values of sx, sy, and sz of a polarization qubit
 Phys. Rev. Lett. 90, 177901 (2003)
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                            M. Eibl; S. Gaertner; M. Bourennane; C. Kurtsiefer; M. Zukowski; H. Weinfurter
                    
                    
                    
 Experimental observation of four-photon entanglement from parametric down-conversion
 Phys. Rev. Lett. 90, 200403 (2003)
 
 