Abstract
Feature Issue on
Optical Wireless Communications (OWC)
We present new quantum
communication (QC) schemes suitable for free-space (wireless) QC implementation. In
particular, we present several entangled QC schemes and propose non-line-of-sight
(NLOS) free-space photon QC. It is shown that in the presence of atmospheric
scattering media, UV photons can be used for NLOS QC. Non-Poisson quantum
fluctuations in an invariance regime can propagate farther than coherent laser
speckle. In such situations the non-Poissonian statistics survive over long
distances and should be taggable with a polarization signature. Quantum noise
observables scale markedly differently with scattering parameters compared to
classical noise observables. Variation of the polarization should allow Yuen-Kumar
QC using non-Poissonian statistics of the beam as an authentication of the signal.
The NLOS communication in the UV would be expected to be possible to at least a
range of 1 km and falls under the category of deliberately short-range QC.
Applications of importance for this method include military stealth and optical
communication in the presence of obstacles such as a forest or urban
environment.
© 2005 Optical Society of America
PDF Article
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