2008/08/21 by Alexander M. Goebel, Alexander Goebel, Claudia Wagenknecht +6 · 1 voice
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #quant-ph
paper · pdf · doi:10.1103/physrevlett.101.080403
published as Phys. Rev. Lett. 101, 080403 (2008) · 4 pages, 4 figures
arxiv created 2008/08/21 · openalex publication_date 2008/08/21 · arxiv published 2008/08/21 · arxiv updated 2008/08/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/02
We report an experimental demonstration of entanglement swapping over two quantum stages. By successful realizations of two cascaded photonic entanglement swapping processes, entanglement is generated and distributed between two photons, that originate from independent sources and do not share any common past. In the experiment we use three pairs of polarization entangled photons and conduct two Bell-state measurements (BSMs) one between the first and second pair, and one between the second and third pair. This results in projecting the remaining two outgoing photons from pair 1 and 3 into an entangled state, as characterized by an entanglement witness. The experiment represents an important step towards a full quantum repeater where multiple entanglement swapping is a key ingredient.