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Experimental delayed-choice entanglement swapping

Autor(en)
Xiaosong Ma, Stefan Zotter, J Kofler, Rupert Ursin, Thomas Jennewein, Caslav Brukner, Anton Zeilinger
Abstrakt

Motivated by the question of which kind of physical interactions and processes are needed for the production of quantum entanglement, Peres has put forward the radical idea of delayed-choice entanglement swapping. There, entanglement can be 'produced a posteriori, after the entangled particles have been measured and may no longer exist'. Here, we report the realization of Peres's gedanken experiment. Using four photons, we can actively delay the choice of measurement-implemented through a high-speed tunable bipartite-state analyser and a quantum random-number generator-on two of the photons into the time-like future of the registration of the other two photons. This effectively projects the two already registered photons onto one of two mutually exclusive quantum states in which the photons are either entangled (quantum correlations) or separable (classical correlations). This can also be viewed as 'quantum steering into the past'.

Organisation(en)
Quantenoptik, Quantennanophysik und Quanteninformation
Externe Organisation(en)
Österreichische Akademie der Wissenschaften (ÖAW)
Journal
Nature Physics
Band
8
Seiten
479-484
Anzahl der Seiten
6
ISSN
1745-2473
DOI
https://doi.org/10.1038/NPHYS2294
Publikationsdatum
2012
Peer-reviewed
Ja
ÖFOS 2012
103026 Quantenoptik
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/243cdf91-57c4-4f61-8742-aebf14e3b52b