It looks like we'll actually have the talk in the center -- stay tuned for the room announcement.
Le 28. 06. 11 00:15, Frédéric Dupuis a écrit :
Hi everyone,
Since it appears to be our Destiny to hold our seminars on Tuesdays, we shall not tempt fate again, and Ben Fortescue's talk will be held today (Tuesday) at 17:00, in HIT K52.
Your [insert adjective here] seminar organizer,
--Frédéric
Speaker: Ben Fortescue Title: Going beyond the share size bound in quantum secret sharing. Date/Time: Monday, June 27, 17:00 Place: HIT K52
Abstract: Quantum secret sharing (QSS) is an important cryptographic protocol which allows a quantum secret to be split between multiple "players", such that only certain authorised player subsets may recover the secret. It is, however, costly in terms of quantum communication and storage; perfect QSS using quantum states requires every player's share to be at least as large as the original secret.
I will discuss some of our recent results in which we improve upon this bound through the use of imperfect "ramp" secret sharing, which allows for smaller shares at the cost of weaker security. We find a specific class of "entanglement sharing" ramp protocols, which allow for smaller shares while still broadly restricting the protocols' information leakage.
Finally I will demonstrate how, by incorporating classical encryption into "hybrid" QSS protocols, quantum share size can be reduced (sometimes drastically) without requiring any reduction in security.
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