Experimental Entanglement Swapping: Entangling Photons That Never Interacted

Pan, Jian-Wei; Bouwmeester, Dik; Weinfurter, Harald; Zeilinger, Anton

doi:10.1103/PhysRevLett.80.3891

Experimental Entanglement Swapping: Entangling Photons That Never Interacted

May 4, 1998

Published in:

Phys.Rev.Lett. 80 (1998) 18, 3891

Published: May 4, 1998

DOI:

10.1103/PhysRevLett.80.3891

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Abstract: (APS)

We experimentally entangle freely propagating particles that never physically interacted with one another or which have never been dynamically coupled by any other means. This demonstrates that quantum entanglement requires the entangled particles neither to come from a common source nor to have interacted in the past. In our experiment we take two pairs of polarization entangled photons and subject one photon from each pair to a Bell-state measurement. This results in projecting the other two outgoing photons into an entangled state.

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