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SUMMARY:More Randomness from the Same Qubits - Matty Hoban (University of 
 Oxford)
DTSTART:20150521T131500Z
DTEND:20150521T141500Z
UID:TALK59487@talks.cam.ac.uk
CONTACT:William Matthews
DESCRIPTION:Quantum non-locality not only challenges our intuitions about 
 nature\, it has been put to work in the nascent field of device-independen
 t quantum information. In particular\, certification of true randomness ca
 n be achieved by non-local correlations if one accepts the validity of the
  no-signalling principle. A large repertoire of protocols has emerged for 
 randomness certification\, expansion and amplification. These protocols te
 nd to be rather costly in terms of ebits. It is natural to ask whether one
  can do better with less and we show that this is indeed possible: more bi
 ts of randomness from the same ebit. This is achieved via making sequences
  of measurements thus expanding the traditional Bell test scenario. This i
 n itself offers up interesting and novel possibilities for device-independ
 ent randomness certification.
LOCATION:MR4\,  Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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