Enhanced autocompensating quantum cryptography system

被引：33

作者：

Bethune, DS ^{[1
]}

Navarro, M ^{[1
]}

Risk, WP ^{[1
]}

机构：

[1] IBM Corp, Almaden Res Ctr, San Jose, CA 95120 USA

来源：

APPLIED OPTICS | 2002年 / 41卷 / 09期

关键词：

D O I：

10.1364/AO.41.001640

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We have improved the hardware and software of our autocompensating system for quantum key distribution by replacing bulk optical components at the end stations with fiber-optic equivalents and implementing software that synchronizes end-station activities, communicates basis choices, corrects errors, and performs privacy amplification over a local area network. The all-fiber-optic arrangement provides stable, efficient, and high-contrast routing of the photons, The low-bit error rate leads to high error-correction efficiency and minimizes data sacrifice during privacy amplification. Characterization measurements made on a number of commercial avalanche photodiodes are presented that highlight the need for improved devices tailored specifically for quantum information applications. A scheme for frequency shifting the photons returning from Alice's station to allow them to be distinguished from backscattered noise photons is also described. (C) 2002 Optical Society of America.

引用

页码：1640 / 1648

页数：9

共 34 条

[1] PHASE-SHIFTED FIBER BRAGG GRATINGS AND THEIR APPLICATION FOR WAVELENGTH DEMULTIPLEXING [J].