Affordable Access

Access to the full text

Experimental realization of quantum cryptography communication in free space

Authors
  • Wang, Chuan1
  • Zhang, Jingfu1
  • Wang, Pingxiao1
  • Deng, Fuguo1
  • Al, Qing1
  • Long, Guilu1, 2
  • 1 Tsinghua University, Department of Physics, Key Laboratory for Quantum Information and Measurements, Beijing, 100084, China , Beijing (China)
  • 2 Tsinghua University, Atomic and Molecular NanoSciences, Beijing, 100084, China , Beijing (China)
Type
Published Article
Journal
Science in China Series G: Physics Mechanics and Astronomy
Publisher
Science China Press
Publication Date
Apr 01, 2005
Volume
48
Issue
2
Pages
237–246
Identifiers
DOI: 10.1360/04yw0185
Source
Springer Nature
Keywords
License
Yellow

Abstract

Utilizing linear optical devices, the principle of B92 quantum key distribution (QKD) protocol is demonstrated in free space with a distance of transmission of 2.2 meters. The faint laser pulses with 650 nm wavelength are used as the single photon sources. The experimental results show that the eavesdropping behavior in the signal transmission can be detected. We also discuss the problems and solutions in using the quantum cryptography communication practically. It is pointed out that one of the approaches to increasing the distance of the quantum communication is to overcome the attenuation of the single photon in transmission. This could not be solved by the use of single photon source, and new quantum communication protocols are needed to solve these problems.

Report this publication

Statistics

Seen <100 times