Experimental Demonstration of Four-Photon Entanglement and High-Fidelity Teleportation

Jian-Wei Pan, Matthew Daniell, Sara Gasparoni, Gregor Weihs, Anton Zeilinger
2001 Physical Review Letters  
We experimentally demonstrate observation of highly pure four-photon GHZ entanglement produced by parametric down-conversion and a projective measurement. At the same time this also demonstrates teleportation of entanglement with very high purity. Not only does the achieved high visibility enable various novel tests of quantum nonlocality, it also opens the possibility to experimentally investigate various quantum computation and communication schemes with linear optics. Our technique can in
more » ... nciple be used to produce entanglement of arbitrarily high order or, equivalently, teleportation and entanglement swapping over multiple stages.
doi:10.1103/physrevlett.86.4435 pmid:11384253 fatcat:enzbzkpqjzauzm7ylfryri5jdi