High-fidelity transmission of polarization encoded qubits from an entangled source over 100 km of fiber

被引：134

作者：

Huebel, Hannes

Vanner, Michael R.

Lederer, Thomas

Blauensteiner, Bibiane

Loruenser, Thomas

Poppe, Andreas

Zeilinger, Anton

机构：

[1] Univ Vienna, Fac Phys, A-1090 Vienna, Austria

[2] Austrian Res Ctr GmbH ARC, A-1220 Vienna, Austria

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

来源：

OPTICS EXPRESS | 2007年 / 15卷 / 12期

关键词：

D O I：

10.1364/OE.15.007853

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate non-degenerate down-conversion at 810 and 1550 nm for long-distance fiber based quantum communication using polarization entangled photon pairs. Measurements of the two-photon visibility, without dark count subtraction, have shown that the quantum correlations ( raw visibility 89%) allow secure quantum cryptography after 100 km of non-zero dispersion shifted fiber using commercially available single photon detectors. In addition, quantum state tomography has revealed little degradation of state negativity, decreasing from 0.99 at the source to 0.93 after 100 km, indicating minimal loss in fidelity during the transmission. (c) 2007 Optical Society of America.

引用

页码：7853 / 7862

页数：10

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