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

Katharina Resch | Zendy; M. Lindenthal | Zendy; B. Blauensteiner | Zendy; H. R. B�hm | Zendy; Alessandro Fedrizzi | Zendy; Christian Kurtsiefer | Zendy; Andreas Poppe | Zendy; T. Schmitt-Manderbach | Zendy; Michael Taraba | Zendy; Rupert Ursin | Zendy; Philip Walther | Zendy; H. Weier | Zendy; Harald Weinfurter | Zendy; A. Zeilinger | Zendy

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

Author(s) -

Katharina Resch,

M. Lindenthal,

B. Blauensteiner,

H. R. B�hm,

Alessandro Fedrizzi,

Christian Kurtsiefer,

Andreas Poppe,

T. Schmitt-Manderbach,

Michael Taraba,

Rupert Ursin,

Philip Walther,

H. Weier,

Harald Weinfurter,

A. Zeilinger

Publication year - 2005

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/opex.13.000202

Subject(s) - quantum entanglement , photon , physics , quantum channel , photon entanglement , communication source , quantum information science , quantum teleportation , coincidence , free space optical communication , quantum sensor , quantum cryptography , quantum mechanics , optics , quantum , quantum network , optical communication , telecommunications , quantum information , computer science , medicine , alternative medicine , pathology

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 freespace 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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