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Title: Distributing entanglement and single photons through an intra-city, free-space quantum channel
Authors: Resch, K.J.
Lindenthal, M.
Blauensteiner, B.
Böhm, H.R.
Fedrizzi, A.
Kurtsiefer, C. 
Poppe, A.
Schmitt-Manderbach, T.
Taraba, M.
Ursin, R.
Walther, P.
Weier, H.
Weinfurter, H.
Zeilinger, A.
Issue Date: Jan-2005
Citation: Resch, K.J., Lindenthal, M., Blauensteiner, B., Böhm, H.R., Fedrizzi, A., Kurtsiefer, C., Poppe, A., Schmitt-Manderbach, T., Taraba, M., Ursin, R., Walther, P., Weier, H., Weinfurter, H., Zeilinger, A. (2005-01). Distributing entanglement and single photons through an intra-city, free-space quantum channel. Optics Express 13 (1) : 202-209. ScholarBank@NUS Repository.
Abstract: We have distributed entangled photons directly through the atmosphere to a receiver station 7.8 km away over the city of Vienna, Austria at night. Detection of one photon from our entangled pairs constitutes a triggered single photon source from the sender. With no direct time-stable connection, the two stations found coincidence counts in the detection events by calculating the cross-correlation of locally-recorded time stamps shared over a public internet channel. For this experiment, our quantum channel was maintained for a total of 40 minutes during which time a coincidence lock found approximately 60000 coincident detection events. The polarization correlations in those events yielded a Bell parameter, S=2.27±0.019, which violates the CHSH-Bell inequality by 14 standard deviations. This result is promising for entanglement-based free-space quantum communication in high-density urban areas. It is also encouraging for optical quantum communication between ground stations and satellites since the length of our free-space link exceeds the atmospheric equivalent. © 2005 Optical Society of America.
Source Title: Optics Express
ISSN: 10944087
DOI: 10.1364/OPEX.13.000202
Appears in Collections:Staff Publications

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