Experimental demonstration of free-space decoy-state quantum key distribution over 144 km

被引：551

作者：

Schmitt-Manderbach, Tobias ^{[1
]}

Weier, Henning

Fuerst, Martin

Ursin, Rupert

Tiefenbacher, Felix

Scheidl, Thomas

Perdigues, Josep

Sodnik, Zoran

Kurtsiefer, Christian

Rarity, John G.

Zeilinger, Anton

Weinfurter, Harald

机构：

[1] Max Planck Inst Quantum Opt, D-85748 Garching, Germany

[2] Univ Munich, Dept Phys, D-80799 Munich, Germany

[3] Univ Vienna, Inst Expt Phys, A-1090 Vienna, Austria

[4] Austrian Acad Sci, Inst Quantum Opt & Quantum Informat, A-1090 Vienna, Austria

[5] European Space Agcy, NL-2200 AG Noordwijk, Netherlands

[6] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

[7] Univ Bristol, Dept Elect & Elect Engn, Bristol BS8 1UB, Avon, England

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.98.010504

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

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