Phys. Rev. Lett. 98, 010504 (2007) [4 pages]Experimental Demonstration of Free-Space Decoy-State Quantum Key Distribution over 144 kmReceived 23 August 2006; published 5 January 2007 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 12.8 bit/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 URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.010504
DOI:
10.1103/PhysRevLett.98.010504
PACS:
03.67.Dd, 03.67.Hk, 42.50.−p
See AlsoSee Also: Danna Rosenberg, Jim W. Harrington, Patrick R. Rice, Philip A. Hiskett, Charles G. Peterson, Richard J. Hughes, Adriana E. Lita, Sae Woo Nam, and Jane E. Nordholt, Long-Distance Decoy-State Quantum Key Distribution in Optical Fiber, Phys. Rev. Lett. 98, 010503 (2007). |
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