An extended abstract should be 2-3 pages in A4 or letter size PDF, using reasonable margins and at least 11pt font. It should give a non-technical, clear and insightful description of the results and main ideas, their impact, and their importance to quantum cryptography.
For a “poster only” submission, a one-page non-technical PDF is sufficient as the extended abstract.
The extended abstract may refer to technical details which are presented elsewhere. In particular, authors may include citations to a full version of the paper that is available on the Arxiv or provided as an attachment. This is strongly recommended for theory submissions to help the peer reviewing process. The extended abstract should not be a compressed version of the full-length paper.