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Experimental Entanglement Swapping: Entangling Photons That Never Interacted

1998; American Physical Society; Volume: 80; Issue: 18 Linguagem: Inglês

10.1103/physrevlett.80.3891

1092-0145

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

Quantum Computing Algorithms and Architecture

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.