Feasibility of quantum key distribution from high altitude platforms

This paper presents the feasibility study of deploying Quantum Key Distribution (QKD) from High Altitude Platforms (HAPs), as a way of securing future communications applications and services. The paper provides a thorough review of the state of the art HAP technologies and summarises the benefits that HAPs can bring to the QKD services. A detailed link budget analysis is presented in the paper to evaluate the feasibility of delivering QKD from stratospheric HAPs flying at 20 km altitude. The results show a generous link budget under most operating conditions which brings the possibility of using diverged beams, thereby simplifying the Pointing, Acquisition and Tracking (PAT) of the optical system on the HAPs and ground, potentially widening the range of future use cases where QKD could be a viable solution.Comment: 12 pages, 11 figures. Comments are welcom

The Stanford CoreNLP Natural Language Processing Toolkit

We describe the design and use of the Stanford CoreNLP toolkit, an extensible pipeline that provides core natural lan-guage analysis. This toolkit is quite widely used, both in the research NLP community and also among commercial and govern-ment users of open source NLP technol-ogy. We suggest that this follows from a simple, approachable design, straight-forward interfaces, the inclusion of ro-bust and good quality analysis compo-nents, and not requiring use of a large amount of associated baggage.