QKD from Space Based Quantum Communications for Phd

Quantum communication via low-orbit satellites offers up a paradigm shift in telecommunications. Providing for unparalleled communication security, this emerging technology will also lead us into the development of the global quantum internet. This research area was given a large boost recently with the launch of the World's first quantum satellite by China. This new satellite creates entangled photon pairs, beaming them down to Earth for subsequent processing and use in a range of communication scenarios. In this PhD project we will leverage optical quantum communications, quantum error correction, and channel modelling, to deliver novel and optimized quantum communication protocols specifically designed for the turbulent atmospheric paths traversed by entangled photons emanating from a satellite. We will be particularly focussed on quantum key distribution (QKD) protocols, and the resulting ultra-secret key rates that can be produced from the different variants of such protocols. We will consider multiple quantum information carriers, such as those involving discrete variables (DV) coded into single photons, and continuous variables (CV) coded into weak laser pulses. Manipulation of these quantum states will involve feedback mechanisms based partially on assessments of the satellite-to-ground channels. This work will lead to state-of-the-art quantum communication protocols that optimize secure communication throughput over very large distances. It offers the PhD candidate the opportunity to enter an exciting and emerging technology frontier that is positioned at the interface of advanced quantum physics and satellite-based communications.

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