Feasibility of 300 km quantum key distribution with entangled states

Scheidl, Thomas, Ursin, Rupert, Fedrizzi, Alessandro, Ramelow, Sven, Ma, Xiao-Song, Herbst, Thomas, Prevedel, Robert, Ratschbacher, Lothar, Kofler, Johannes, Jennewein, Thomas and Zeilinger, Anton (2009) Feasibility of 300 km quantum key distribution with entangled states. New Journal of Physics, 11 Article # 085002: 1-14. doi:10.1088/1367-2630/11/8/085002

Author Scheidl, Thomas
Ursin, Rupert
Fedrizzi, Alessandro
Ramelow, Sven
Ma, Xiao-Song
Herbst, Thomas
Prevedel, Robert
Ratschbacher, Lothar
Kofler, Johannes
Jennewein, Thomas
Zeilinger, Anton
Title Feasibility of 300 km quantum key distribution with entangled states
Journal name New Journal of Physics   Check publisher's open access policy
ISSN 1367-2630
Publication date 2009-08-04
Sub-type Article (original research)
DOI 10.1088/1367-2630/11/8/085002
Open Access Status DOI
Volume 11
Issue Article # 085002
Start page 1
End page 14
Total pages 14
Place of publication Bristol, England
Publisher Institute of Physics
Language eng
Subject 0299 Other Physical Sciences
Abstract A significant limitation of practical quantum key distribution (QKD) setups is currently their limited operational range. It has recently been emphasized (Ma et al 2007 Phys. Rev. A 76 012307) that entanglementbased QKD systems can tolerate higher channel losses than systems based on weak coherent laser pulses (WCP), in particular, when the source is located symmetrically between the two communicating parties, Alice and Bob. In the work presented here, we experimentally study this important advantage by implementing different entanglement-based QKD setups on a 144 km free-space link between the two Canary Islands of La Palma and Tenerife. We established three different configurations where the entangled photon source was placed at Alice's location, asymmetrically between Alice and Bob and symmetrically in the middle between Alice and Bob, respectively. The resulting quantum channel attenuations of 35, 58 and 71 dB, respectively, significantly exceed the limit for WCP systems (Ma et al 2007 Phys. Rev. A 76 012307). This confirms that QKD over distances of 300 km and even more is feasible with entangled state sources placed in the middle between Alice and Bob. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
Keyword Channel loss
Entangled photons
Entangled state
Free space
Operational range
Quantum channel
Quantum key distribution
Q-Index Code C1
Q-Index Status Provisional Code

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
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Created: Fri, 24 Sep 2010, 11:30:29 EST by Ms May Balasaize on behalf of Faculty of Science