Capraro, Ivan (2008) Advanced Techniques in Free Space Quantum Communication. [Ph.D. thesis]
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The main argument of this thesis is the application of advanced techniques for the optimization of single photon communication and in general of single photon applications. The work is inserted in the contest of various projects that involve the departments of Information Engineering and Astronomy of the University of Padua.
In particular my contribution has been the development of a quantum cryptography setup that we called QuAKE. The system has been designed and implemented in our labs and include in the hardware some advanced temporal and spatial filtering techniques. These features has been realized respectively with an ad hoc electronics and with an adaptive optics system, the latter developed entirely in our department. The high level software for quantum cryptography has been also implemented and many optimizations have been realized both in the logical design and in the single algorithms.
The last part of this thesis describes an astronomical instrument, called
AquEYE, developed by our group and capable of time tagging single photons coming from celestial sources. In particular a description of the time and frequency distribution unit is given since this has been my contribution to the AquEYE instrument so far.
The thesis is organized as follows: after an introduction to quantum cryp-
tography (chapter 1), the QuAKE system is presented (chapter 2), the electronics and the optical setup are described (chapter 3) as well as the adaptive optics system (chapter 4), it follows a description of the results obtained testing the adaptive optics system outdoor and on the QuAKE system (chapter 5) and the description of the high level software and the related results (chapter 6), last a description on the timing and frequency unit of AquEYE is presented as well as some of the early results of the instrument (chapter 7).
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