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Title: Experimental demonstration of free-space decoy-state quantum key distribution over 144 km
Authors: Schmitt-Manderbach, T.
Weier, H.
Fürst, M.
Ursin, R.
Tiefenbacher, F.
Scheidl, T.
Perdigues, J.
Sodnik, Z.
Kurtsiefer, C. 
Rarity, J.G.
Zeilinger, A.
Weinfurter, H.
Issue Date: 2007
Citation: Schmitt-Manderbach, T., Weier, H., Fürst, M., Ursin, R., Tiefenbacher, F., Scheidl, T., Perdigues, J., Sodnik, Z., Kurtsiefer, C., Rarity, J.G., Zeilinger, A., Weinfurter, H. (2007). Experimental demonstration of free-space decoy-state quantum key distribution over 144 km. Physical Review Letters 98 (1) : -. ScholarBank@NUS Repository.
Abstract: We report on the experimental implementation of a Bennett-Brassard 1984 (BB84) protocol type quantum key distribution over a 144 km free-space link using weak coherent laser pulses. Optimization of the link transmission was achieved with bidirectional active telescope tracking, and the security was ensured by employing decoy-state analysis. This enabled us to distribute a secure key at a rate of 12.8bit/s at an attenuation of about 35 dB. Utilizing a simple transmitter setup and an optical ground station capable of tracking a spacecraft in low earth orbit, this outdoor experiment demonstrates the feasibility of global key distribution via satellites. © 2007 The American Physical Society.
Source Title: Physical Review Letters
ISSN: 00319007
DOI: 10.1103/PhysRevLett.98.010504
Appears in Collections:Staff Publications

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