Abstract

SANTOS AGUILAR, Joel; ARVIZU MONDRAGON, Arturo  and  LOPEZ LEYVA, Josué Aarón. Implementation of antennas for optical quantum communication links using weak coherent states in free space. Acta univ [online]. 2016, vol.26, n.3, pp.33-49. ISSN 2007-9621.  https://doi.org/10.15174/au.2016.883.

The classical optical communication systems in free space have been extensively studied, in contrast to quantum systems which until relatively recently have acquired great interest for satellite applications and quantum key distribution. Proper design of the elements that collect light in the receiver is critical for good performance. So, the main objective of this paper is to present an optical antennas design methodology used in quantum communications. This article shows feasibility and utility of paraxial theory use for this design which allows the use of optical components such as astronomical telescopes used in conventional classical schemes. An optical antenna for 1550 nm was designed with the help of simulation tools and a commercial Cassegrain type telescope. Also, a proof of concept in the laboratory was performed where three photons per bit were captured, validating as well the suggested methodology.

Keywords : Free space optical communications; quantum communications; optical antenna; weak coherent states; Cassegrain reflector.