BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Partially smoothed information measures - Mario Berta (Imperial Co
 llege London)
DTSTART:20180726T100000Z
DTEND:20180726T104500Z
UID:TALK108391@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Smooth entropies are a tool for quantifying resource trade-off
 s in (quantum) information theory and cryptography. In typical bi- and mul
 ti-partite problems\, however\, some of the sub-systems are often left unc
 hanged and this is not reflected by the standard smoothing of information 
 measures over a ball of close states. We propose to smooth instead only ov
 er a ball of close states which also have some of the reduced states on th
 e relevant sub-systems fixed. This partial smoothing of information measur
 es naturally allows to give more refined characterizations of various info
 rmation-theoretic problems in the one-shot setting. In particular\, we imm
 ediately get asymptotic second-order characterizations for tasks such as p
 rivacy amplification against classical side information or classical state
  splitting. For quantum problems like state merging the general resource t
 rade-off is tightly characterized by partially smoothed information measur
 es as well. However\, for quantum systems we can so far only give the asym
 ptotic first-order expansion of these quantities.
LOCATION:Seminar Room 1\, Newton Institute
END:VEVENT
END:VCALENDAR