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

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

2005-01-03

arxiv.org/abs/quant-ph/0501008v2

Opt. Express 13, 202-209 (2005)

Physics

Quantum Physics

8 pages including 1 figure and 2 tables. The first two authors contributed equally to this work

Scientific paper

10.1364/OPEX.13.000202

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/pm0.019, 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.

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