Distributing entanglement and single photons through an intra-city, free-space quantum channel

Entangled photons are distributed directly through the atmosphere to a receiver station 7.8 km away at night over the city center of Vienna, Austria. Without a time-stable connection, the two stations found coincidence counts in the detection events through the cross-correlation of locally-recorded...

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Bibliographic Details
Main Authors: Resch, K.J., Lindenthal, M., Blauensteiner, B., Bohm, H.R., Fedrizzi, A., Taraba, M., Ursin, R., Walther, P., Poppe, A., Schmitt-Manderbach, T., Weier, H., Weinfurter, H., Zeilinger, A.
Format: Conference Proceeding
Language:English
Subjects:
Atmosphere
Cities and towns
Event detection
Internet
Optical receivers
Polarization
Quantum entanglement
Rotation measurement
Telescopes
Time measurement
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Summary:Entangled photons are distributed directly through the atmosphere to a receiver station 7.8 km away at night over the city center of Vienna, Austria. Without a time-stable connection, the two stations found coincidence counts in the detection events through the cross-correlation of locally-recorded time stamps shared over a public Internet channel. As such, the sending and receiver stations were completely independent. The polarization correlations contained in the measured time tags are sufficient to convincingly violate a CHSH-Bell inequality and demonstrate entanglement between the two city buildings.
DOI:10.1109/EQEC.2005.1567464